New Paris startup Jooce says they are targeting the “cybercafe generation” with their new Flash-based web operating system and sharing platform.

Jooce is most like Goowy, another Flash based web OS/desktop. But Jooce is different enough to merit a closer look. They says 500 million people a day log on to the Internet from a cybercafe, and they are the target of the Jooce product. They want access to core customized applications like instant messaging, storage, media player, email and widgets. Jooce offers all of that, and is also a private sharing network among friends.

Every user has their own private desktop for IM, email, storage, etc. But they also have another desktop that friends can access and grab shared files, or drop off a file that they want to share.

The company has raised an initial seed round of financing from Mangrove Capital Partners, one of the original investors in Skype. It is currently a closed platform, but they will be releasing an API in the near future.

Jooce enters a crowded space but is targeting a clear audience. Being backed by Mangrove doesn’t hurt either.

Israel-based G.ho.st, another web OS startup that recently launched, is taking a different approach from Jooce. They’ve built some basic applications to show off the platform but are counting on third parties to do most of the heavy lifting via their API.