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UPDATED JUNE 2011- you can also do the SAME with iOS 4.3.3 by flashing the baseband, all rules apply, except you will browse for 4.3.3 firmware instead for your device.
UPDATE FEB 2011- after this video you will get 06.15, you can then use this here to update and maintain your custom baseband http://www.youtube.com/watch?v=seWEOFH2tMI
Written Guide : http://tinyurl.com/32gghuf
3GS users, your iPhone might be tethered, see 4.2.1 jailbreak info/guide for reference : http://www.youtube.com/watch?v=P6RJcxqFdE4
iPhone 3G/3GS 4.2.1 - http://tinyurl.com/26qlwnl
iPhone 3G/3GS 4.1 - http://tinyurl.com/ycuopo
Mac RedSn0w 0.9.6b5 - http://tinyurl.com/6xfzmcv
Windows RedSn0w 0.9.6b5 - http://tinyurl.com/66my4an
Use these IF YOU HAVE iOS 4.3.3 for iPhone 3GS
iPhone 3GS 4.3.3 - http://tinyurl.com/4yet99o
Redsn0w RC16 for 4.3.3 Windows : http://tinyurl.com/6ylncp2
Redsn0w RC16 Mac 4.3.3 : http://tinyurl.com/3wzu7ez
(windows vista/7 users, right click on .exe, properties, set compatibility mode to XP)
EXTRA INFO :
PLEASE UNDERSTAND THE CONSEQUENCES OF FLASHING TO 06.15.
1. There is no way to come back down from 06.15, and there's no hiding the baseband version from Apple. You'll be voiding your warranty in a very obvious way.
2. If some future baseband comes out with a critical fix, you won't be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn't update to it if you wanted to keep your unlock anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won't ever be able to restore to stock firmware (it will fail). You'll need to only restore to custom IPSWs (then again, if you're unlocker you should already be doing that). You can make a custom firmware by using PwnageTool for Mac or Sn0wBreeze for Windows.