Linux 32-bit Users:

I just built a version that I believe works on 32-bit Linux without the "Too many open files" error.  Either build the latest "testing" branch, or download the debian package.   If you still get the error, you can manually set the number of files LevelDB is allowed to open using the --maxfiles=X argument when you run it.  I have set it to 75 for (Linux && 32bit), but I suppose it might actually need to be lower for some systems (though I doubt it).    My testing shows that it doesn't make a huge difference in terms of speed of database building or scanning.  I was tempted to just do it for all OS/arch.  Meh.  Please let me know if it works. 

Tomorrow i should 0.89.99.14 which includes CircusPeanut's integration message signing&verifiaction (created under a bounty by JackJack).  That may be one of the last testing versions, unless more people pop up with serious issues.  It appears to work pretty reliably on all OS except OSX, and there's nothing I can do about that right now (it appears to be a a problem with OSX 10.9 + PyQt, we might just have to wait it out).