It WAS NOT a joke. They had every intention on closing for good on March 31st but the creators of the site bought it back.
Here's the explination copied from their site:
FileFront has been acquired by the original founders of the site and will NOT be suspended as previously announced. This is NOT an April Fool's Joke.
After learning about Ziff Davis Media's plan to shut down FileFront at the end of March, the original founders of FileFront made the decision to buy it back from Ziff Davis Media.
We're happy to announce to the gaming community that as of today, April 1st, 2009, FileFront is a completely independent company again and is no longer part of Ziff Davis Media. All previously suspended services should be active and working again. We thank Ziff Davis Media for their cooperation and willingness to keep the site and community alive.
Due to the very unfortunate timing of this event and related announcements on March 24th and April 1st (April Fool's Day), we'd like to make it perfectly clear that:
1) The March 24th announcement about FileFront shutting down was NOT an early April Fool's joke and Ziff Davis Media had every intention of shutting down FileFront by the end of March.
2) This announcement about the original founders buying back FileFront from Ziff Davis Media is also NOT an April Fool's joke.
3) We're making this announcement on April 1st because the deal was completed today and we want to bring all services back online immediately.
4) We would NEVER shut down FileFront as an April Fool's joke.
5) We are happy to be back!
FileFront has existed in one form or another (originally as FileLeech and Voodoo Extreme's downloads) since 1997. In the last 12 years, FileFront has become the gaming community's most comprehensive and trafficked library hosting millions of files for thousands of games while requiring no registration and providing uncapped download speeds. We look forward to improving FileFront and serving the gaming community for years to come.
Welcome home. Game On!
Email us, firstname.lastname@example.org
Anyway, it's good to have them back again :]