I just took a quick spin, so your mileage may vary, but trying out xdrive (AOL, 5GB), skydrive (Microsoft, 5GB) and adrive (? 50GB) freebie offerings under linux (Ubuntu/Firefox 3.01) and the winner is...

adrive.com. All three of them rely on either funky java clients, adobe air (you need to run that in wine) for xdrive, or worst of all, form submission one at a time for skydrive. Unlike the other two, adrive's java client worked without any mojo here. I was able to upload a folder just by, gasp, selecting the folder.

50GB in the sky for nothing sounds like a good deal. Privacy/tin foil hat types will want to limit this storage to "riskless" stuff like photos. I could really see the value of this for vacation photo store. Never hurts to have a copy of those digital photos backed up before heading home. Anyway, give all three a spin for yourself.

• http://www.adrive.com
• http://www.xdrive.com
• http://skydrive.live.com