It’s what I do. I buy a bunch of cheap SD cards from 7dayshop, usually 8Gb ones, and put them to one side when they’re full up, but I also copy the photos I take from any particular day or event onto my iPad with the Apple Camera Kit, so I can see the photos properly and cull the iffy ones that weren’t obviously crap from the thumbnails.
That way I can scroll back and look at older photos, and upload easily to Ohotobucket or Flickr. I also connect the pad to the Mac every so often to do a full backup, plus there’s Photostream and Dropbox too.
The pad’s currently got over 6000 photos on it.
iPhoto has over 26,000…
Which reminds me, I really must order some more cards, 7dayshop are doing 8Gb cards for around £3.50…
I think 16Gb ones are less than a tenner.