are cracks in the foundation or the basement walls. That is a big deal. Also check soundness of the ceiling beams in the basement, that could also indicate a water damaged house.

Edit: Look for water lines in the basement also, or water stains on the floor that could indicate leakage. Check walls for water trail stains as well, especially near the outside of the foundation.

Another thing would be to check for termites. Take a screwdriver or pocketknife and gently poke beams and wooden struts and things that stick out, make sure nothing feels "soft" or crumbly.

Other water damage can be found in the bathrooms, push on the tile walls, see if they feel firm. If they ripple, there's probably water damage in the walls, especially check near bathtubs and shower cells.

Test all the water, run the faucets and be sure plumbing works and looks up to specs. Check any exposed plumbing for leaks and water stains.

Check the electrical outlets, make sure they work, test one or so in every room if possible. (You can take a simple nightlight for this purpose). Make sure they are grounded, especially if you want to be running computers, because it's expensive to ground them later.

Edit: You can use a grounding checker for this purpose, also, we had one, it's something you get at the hardware store and you plug it in and if the outlet is grounded, the plug thing lights up a small light.

Check the roof as much as possible. This isn't as easy, but you can climb up on a ladder and examine the roof visually, and also scan all the ceilings for any sign of water stains or damage. If possible, get up in the attic, if they have one, and examine the underside of the roof as well.

I know there's a few more, (we learned all this before buying our house), but I can't think of them right now. If I remember others I'll post them.

Good luck!

Brenda