As long as I can get to the files without a huge amount of trouble (no popup ads, etc) I don't mind using whatever (in order to download), but my combination of laziness in signing up for services and desire to use whatever works and is simplest for me has led to my using a public folder from Dropbox for sharing podfic files. I've never heard anyone say it's hard to get ahold of the files that way, so it's been working out fine so far! I've also got a lot of web space with no bandwidth limit, so I'm frequently tempted to just shove everything there, but that requires using an FTP client, whereas with Dropbox I can do everything from my desktop. :) But having a download counter would be awfully nice.