321 Prime Search (Sieve) subproject has reached the "optimal zone" and will be suspended on 22 April 2011. This means that no more work for 321 Prime Search (Sieve) will be added after 22nd, but outstanding work will be allowed to complete. 321 Prime Search (LLR) will not be affected and will continue running.
Once the work is depleted, project preferences will be automatically changed for people who have selected only 321 Prime Search in their preferences. Default subprojects will be selected, but you may wish to proactively choose a subproject or two.
For people fighting for a badge this may be a good opportunity to push if you are lacking just a few credits.