JetBrains just released a First Candidate release of ReSharper 4.0 marked as Stable!

Date Build # Links Status Comment Known problems Fixed issues
19 May 2008 804 Download Beta Candidate Stable None Fixes

You might read more about this version 4.0 on the ReSharper 4.0 EAP Notes

I am using the 4.0 EAP for quite some time and I am really happy with it! In fact I just can’t work without ReSharper!