I've ordered some stuff with cafepress...I actually just ordered something today from there. The quality is pretty good, but I feel like there might be some other bulk company out there that would be a better way to go if you wanted to do the t-shirt thing. I personally don't know how effective it would be to have people walking around with t-shirts of your company. You would probably only get a very small return on it.

Business cards are pretty essential to having your own business. I would highly recommend investing in some business cards. One good online printing company is http://www.vistaprint.com/ .