redsn0w 0.9.9b6 fixes Location Services issue for 3GS w/06.15. See #14 is.gd/6eek4Y to re-run it over existing iOS5 JB
redsn0w's "Custom IPSW" feature is ready for Mac users to try. See update #13 is.gd/6eek4Y (please read the warnings!)
Since Apple still serves the 4.1 IPSW (not blobs!), we'll do a Windows redsn0w release for untethered 4.2.1 via Monte-4.1
Ported Monte back to 4.1 kernel (SHSH blobs). Next step: porting it forward to 4.3beta!