Version 4.1.1 is released and downloadable for Windows/Linux32/Linux64 (Solaris to follow in a few days).
The main change is the new database code for region query is enabled, and has been tested and seems to be stable now after a few fixes related to deletion etc. The main advantage is (1) better speed and (2) reduced memory usage.
There are several other small bugfixes, see the change log in the documentation for details.
Also, the Windows build is moving to VC++ 2008 (VC9). Initial tests show that raw code performance from this compiler are 5-10% slower than VC++ 2003 (VC7), however VC9 has a lot less bugs and better language support, and a bit of careful code profiling analysis can make up for the initial apparent performance losses. If you see any problems, please let us know.