Page 1 of Projector Placing?

Does anyone have some good suggestions on where and how to place a table top projector? I have a sony vpl-cs3 and it does`nt have ceiling mount facilities. At the moment I have it on a coffee table and it`s always getting bumped, so it has to be re-focused every time!

Also some help on the screen. Im using a rollerblind thats 2 metres across and though it does a fairly good job, I now have the funds to buy a dedicated one. How much would it cost for the same size sreen as the above and where from?

I know someone can help, cheers guys.