[mathias_10gen]

2.0 has a new index format that should reduce your index sizes by ~20-30% to fit more in RAM. If you haven't looked at upgrading yet, it is probably worth testing with 2.0.1 to see how it performs in your use case. You will need to reindex() or restore from a dump to take advantage of the new index format.

[rfurlan]

Yes, we are aware and we can't wait to upgrade, we will probably do it at our next scheduled downtime :)