The date says it has been out a couple days, but I guess I missed all those annoucements (would be a great item to have an rss feed for) but it looks like ESRI has released ArcGIS 9.1 Service Pack 2 (includes ArcGIS Server SP2), ArcIMS 9.1 Service Pack 2 and ArcSDE 9.1 Service Pack 2. The list of fixes is also available on those pages so take a look and see if your favorite issue (cough bug) was fixed.