This is kind of frustrating. When I went to load the images off of my camera after my trip to Oregon, I noticed some of them came out corrupted. Only 4 or 5 were really bad, but a handful had a few rows of pixels missing at the end. I have never had this happen before. I thought something was screwed up with the transfer, so I tried installing the Canon drivers, switching communication modes, using different applications, etc. I noticed when I used Picasa, it had red X's indicating basically ALL of the images were corrupt. The strange thing is, when I view the images on the camera itself, they don't look corrupt. The first image is COMPLETELY gone, except for about 10 rows of pixels at the top, which only display in Picasa (Windows viewer just says "drawing failed.").
This was from the first card I used. I had a 1 gig card prior to the trip, and when it was nearly full, I purchased a second one. The second one appears to be fine, but I haven't done thorough testing on it yet. I'm hesitant to wipe the card until I know what I've got is as good as it's going to get. There might be some repair program I can use to recover the data. The camera can still read it fine, after all, but I'm not sure if there's other information being stored elsewhere.