I've just installed my new Sanyo Z4 to the wall. I used the following TV mount from Ikea and just thought I'd post my results because I'm very happy with it.
This is the mount I used.
I'm sure that any pj could be mounted to any TV bracket but this one in particular is very solid, exactly the same footprint as the Z4 (the lip at the front is even the correct angle to hug the front of the pj) and it's the same silver colour.
So, if you can mount your projector to the wall and you want a nice cheep but well made mount then I'd pop to your nearest Ikea.