Some time ago -- probably back when my iPhone 3G was the hot 'new' phone -- I was annoyed that my trusty Canon SD800IS didn't have GPS for photo tagging. Accurate dates on photos are very useful, as I am painfully reminded every time I combine photos from multiple cameras of the same event (DST often varies, but camera clocks just aren't very accurate). GPS coordinates are less important but also quite handy.

I realized, however, that rather than my next dedicated pocket camera having GPS, more likely the iPhone would eventually have a competitive camera, and the iPhone of course already has decent GPS and accurate time (generally from the cellular network).

The iPhone 3GS camera was much improved, but still completely inadequate for me. Lots of people, including Amy use cellphone cameras exclusively (she's about to move up from my old 3G to my now-old 3GS), but they tend to look at the photos on other phones, and/or post them at sites like Facebook that never show high-res photos anyway.

For me, the only real problems with the 3GS were its camera and its battery life. The battery was normally okay, but recently I'd get to work in the morning, after watching videos for about an hour, and find the battery down to 60% charge. I expect to get it replaced under AppleCare this week, and think Amy will be happy with it. But the camera was useless except for Twitter, and the very rare occasions when I needed a camera but didn't have my SD800IS.

So I was very happy to see Derek Powazek say Apple had done a good job with the iPhone 4 camera.

I took some comparison shots Saturday night in low light, and I'm happy with the iPhone's pictures. I'll probably keep carrying the S800IS on weekends, since I already have it and the habit -- and it does take somewhat better photos, with more room for cropping. But now pictures I post to Twitter will be decent, and I'll be more inclined to take pictures during the week without my Canon. In the future, when the SD800IS dies, I won't need to replace it.

The Canon still has advantages over my T1i for video, though -- it's much more forgiving for focus, and AF on the T1i is loud, not a factor on the SD800IS.