Continuing on from the iPhone entries of late, Memova have release a handy contacts syncing and backup service – my.memova. It does not have as much packed into it as MobileMe but considering you may only want to back up your contacts on the Internet cloud and it is also free, I would say it’s a pretty good option.
There is an iPhone application to make the process simple and the interface on the web app is relatively pretty. Powered by phpBB, it is relatively similar to other web based contact syncing apps out there.
If you’re wanting something else other than a backup of your contacts on your PC or Mac and you’re using an iPhone, this one gets the thumbs up!
Gotta say this is a very useful site to back up your contacts. And free!