Wuala is a "cloud service" by LaCie, the European hard disk manufacturer. Their claim: "Backup. Sync. Share. Access Everywhere. All data encrypted on your computer." It's available for windows, the Mac, Unix, and "mobile devices."
It's considered better than DropBox by some—especially as far as security is concerned. Others dispute this claim. 1 GB is free, 10 GB cost 19 EUR per year (25 GB - 39 EUR, 50 GB - 59 EUR, 100 GB - 99 EUR, 250 GB - 229 EUR). You can pay, using paypal.
Features considered "pro features" are now available in the free version as well.
1. Just do a search for "Wuala." It's supposed to be pronounced like "voilà," by the way.