Very nice SG. I love my SD400. It's a great size and the quality of the camera itself is excellent. It has a nice solid feel with an actual metal case. The pics turn out great too. The software is pretty good and there is minimal shutter lag. The camera boots up pretty quick.

The SD550 is noticeably thicker and heavier than the SD400 though. I opted for the SD400 because of it's size, 5.0 MP is plenty good, and the price was right. I bought it from Costco for $300. Sold a Canon A70 for $100 to offset the $300 and I still have a Canon A80 and a Minolta DiMage 7i, oh and a crappy ass HP I like to keep in the X5 just in case.

I don't know about you guys but I would definitely opt for a high speed SD card. Some people don't think they are necessary but I did a side by side with my friend's SD400 using a Sandisk Ultra 1G and my SD400 using a Kingston 256 MB and his was a few seconds faster. I say it's worth the extra bucks.

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