As MongoDB’s 1.8 release cycle is drawing to a close, I decided to update the Fedora 15 packages of MongoDB to the 1.7.x branch. The upgrade process from 1.6 to the 1.7.x/1.8.x series should be fairly straightforward. On non-replication/non-sharded setups it should be completely transparent: just upgrade the RPMs and restart; everything should work. For replication/sharded setups, just follow the official documentation.
Once the official 1.8.0 is released I will be pushing updates into all existing Fedora and EPEL repos. As always, please test and let me know if you have any questions. Thanks!