I tole ya it was easy And yeah, a cement texture isn’t exactly hard to do. If you want to look into texturing tips, blender art magazine issue 12 has a heap of tips, as well as just how to remove seams, as blendernewb is talking about. (find it at http://www.blenderart.org/)
I would suggest that after you have the basic texture down, you make some manual details, like grime and maybe a bit of graffiti. It helps to make a good texture job look outstanding. If you open the image in the GIMP or pedoshop or whatever you use, modify it and save it, then you can go into blender and press alt+r with the cursor over the UV editor window, and the texture updates. It’s a handy shortcut to know when you are modifying your textures on the fly.
And you should really take all the time you can to get to know the ins and outs of UV mapping, it is the only way you can texture for games, and it’s the only way you can get really good results for any render. Blender internal can only go so far. Keep blending!