Lou, if you're looking at the flip, make sure you get the new one. They're a little more expensive, but apparently are a lot better for sending files, plus you can store more files on them. You can convert the file size of flip videos if you have itunes installed on your computer (mac or pc) you drag the video into itunes and it will give you options for sharing. They're really easy to use, we have a few kids come out here with them...

I haven't seen the Sony's, but have heard they're great as well...

Hahaha I'm no help!! LOL