If you mean a montage (a bunch of pictures blended into each other) then use PS not Illustrator.
If you mean a collage (a bunch of pictures arranged together) then Illustrator works great, though if necessary it can also be done in PS without too much more difficulty.
~Doc
Doc/Miss007,
I should have said montage. I normally use PS working with single images. For friends wanting A4 sheets with multiple jpgs (not contact sheets) I have tried out Illustrator and it seems easier than PS to drag, scale, angle images. Downside is that it has very slow save, occasionally freezes (on XP) and printing is too slow. (no I do not have print bitmap image selected)
The thought struck me that there are other programs out there which for non commercial use could provide things like fixed scaling, frames and backgrounds. I was just asking for the PS group opinions.
Beemer