What a great question to open the flood gates

Second only to an oil question, you'll get lots of opinions on this one.
My list of uncommon but must have or I'll just pay someone to do it are:
Gear Wrenches - I love my Crescent offset set. They have an angled head and a direction button near the head. I have a couple of the non-angled GearWrench brand ones and they are fine, but in 10mm especially the offset lets me access things that I'd otherwise have a problem with.
http://www.amazon.com/exec/obidos/tg/de ... 4?v=glance
These pullers are wonderful when working on the steering:
http://www.harborfreight.com/cpi/ctaf/D ... mber=36861
Here is the Tool Sermon that I wrote for a few years back for a friend who had no tools at all:
My recommendations:
Combination wrenches:
http://www.harborfreight.com/cpi/ctaf/D ... number=541
This set it metric, but is a good example of what I'd suggest. It has
larger than you will probably need on a regular basis, so take the 2
largest ones out and leave them in the garage. The roll up pouch is very
handy, but will wear out in a year or two. After that, a small mechanics
toolbox will do well.
SAE here:
http://www.harborfreight.com/cpi/ctaf/D ... number=551
Pliers:
An assortment is good. Get at least needlenose, standard slip joint
("regular), and dikes ("diagonal cutters").
If you want a good assortment, here is what I'd get:
Big pliers:
http://www.harborfreight.com/cpi/ctaf/D ... mber=44874
Vice-Grip:
http://www.harborfreight.com/cpi/ctaf/D ... umber=5827
And a set similar to these:
http://www.harborfreight.com/cpi/ctaf/D ... mber=35439
This set will do fine, but you'd be better off getting a 4 or 5 piece set
from Sears or similar. I got a 5 piece set at Sears for $20. It wasn't
craftsman, but has lasted me a few years and they have a nice feel.
Sockets:
I'd recommend getting a good set of sockets. I had great luck with Popular Mechanics brand from Walmart, but it turns out that they are made by Stanley, which Walmart also sells. Home depot has Husky, and Lowes has Cobalt. Craftsman, Husky or Cobalt are preferred, but you pay a premium for them. I am not at the point of paying that price yet, so I have a decent set, and went and bought a 3/8" drive ratchet handle from Sears, since that is what you will probably break, and sears will replace it for free, for life.
So, for a complete set from Harbor Freight, get:
http://www.harborfreight.com/cpi/ctaf/D ... mber=45468
If you get excited, also get a deep wall set like:
http://www.harborfreight.com/cpi/ctaf/D ... umber=4467 in either 1/2" drive or 3/8" drive.
Don't bother with swivels, impact sockets, ball joint sockets or any of
that until such point as you know that you need them.
Get a 3 piece 3/8" drive extension set however. 2", 4" and 6" makes a good set.
http://www.harborfreight.com/cpi/ctaf/D ... umber=2762
is a good set.
Screwdrivers:
Again, quality will make a difference here. Go get a good set locally. I
like craftsman over the others, but I've had very good luck with the
"cheapies" from tool companies - If you want to get a set from HF, here is
one that will probably serve you well:
http://www.harborfreight.com/cpi/ctaf/D ... umber=1648
Also buy some kind of case that you like. Pick something locally so that you can get a feel for it. Thin plastic is bad. Thick plastic or metal is
good. You will use this as a seat when you are trying to get a stuck brake
caliper off some day.
Optional:
A hammer is a good idea. Something with a metal or fiberglass handle is a big plus. If you spend more than $15 on a hammer for the truck, you will have wasted money.
http://www.harborfreight.com/cpi/ctaf/D ... umber=7349 will do just fine for truck stuff.
A pry bar is always useful. A crowbar of almost any shape will do for most purposes.
A knife of some kind. Almost anything that is sharp. It sucks cutting off a
radiator hose with your screwdriver and a pair of wire cutters.
Electrical tape, always good. Spare fuses, zip ties and electrical crimp
on connectors are also a plus. I also carry a spare set of spark plug
wires and a distributor cap. They are cheap and make for great
insurance. Radiator hose, heater hose, and duct tape round out my list.
I'm not in any way tied to harbor freight. They sell some real crap. For
your uses, these tools probably will be fine. If not, upgrade. It won't
hurt you to get something better up front, but like with my pitman arm puller, I won't use it very much. Ever. If you prefer craftsman, buy
those. The socket wrench, screwdrivers and pliers are where the quality
will make a big difference in feel.
For the house, I'll add a few tools to the list:
Outlet tester. This has 3 lights and tells you that an outlet is
functioning properly (or not)
Adjustable wrench.
http://www.harborfreight.com/cpi/ctaf/D ... umber=3288
Drill + bits. If I had to have only one drill, I'd have a corded drill.
I do use the cordless one more often now, but there are some tasks that
cannot be done with a cordless drill, mostly because of the limits of
battery life. Be sure to get some good screwdriver bits at the same time.
Tape Measure + level. The level doesn't need to be long or expensive.
Test it in the store. Place it on a shelf (level or not) and note the
position of the bubble. Spin the level end-to-end and see if the bubble
sits in the same spot (with regard to the center line on the glass). If
it doesn't, get a different level.
Set of drywall anchors. These are the plastic anchors that hold screws in
drywall, and a set will come with screws + anchors.
Hand saw. Start with a mitre saw + mitre box. They are sold in sets and
will cut almost anything that you need to trim around the house.
Gloves + safety glasses. Get glasses that are comfy, otherwise you won't
wear them.
-Tad