What's the best projected image size using projectors?

[alaxus]

I'm assuming you mean the screen door effect LCD projectors have? Really, you get so used to it if you run LCD projectors that you pretty much forget about it. Isn't this issue gone in DLP projectors?

No its still a issue with DLP's as well. Each pixel is still surrounded by a tiny black line. You notice it mostly when you have a bright blue sky environment, which is where I have set my limit. Any image darker than this and the screen door issue reduces greatly.
My eyes are a bit sensitive on this issue, as I can also see the pixels on my 42" plasma tv (848X480) from about 3 meters away, I find it quite annoying.

Each to there own I reckon, to some it may be a issue, others may not even see the screen door effect.