For photographing Lego I can recommand one camera:
Fuji FinePix A345
BUT there are some problems with this cam:
a) When using the close up mode there is no flash, that's why you need some external light. (I use a large white sheet of paper as background in combination with two desk lamps, that works really fine for me)
b) Normal pictures (you know, everything else that is NOT made from plastic parts ) are not really good. First of all, almost every picture is blurry as long as you don't use the "sports mode", even if you make the pics carefully. Then the compression sometimes is worse than it could be. (This does not affect close up pictures though)
Even if it is no all-day cam, it worked perfectly for me for making Lego pictures. Before this cam I had the chance to use four other digicams which all had major flaws, the worst case was a Canon which simply did the blurriest close ups I ever saw.