I'm about to transition into 3.1.2 from 3.0.
Are there any hacks that aren't working so far for it?
What I'm specifically looking for are...
-A2DP
-Backgrounder
-Bosspaper
-MMS
-Insomnia
-OpenSSH
-Rotation Inhibitor
-SBSettings (realllllllly hoping this one works)
-Volume Boost (also very important to me, as I'm on a 2G)
-3G Unrestrictor/Voipover3g
-Mobile Terminal
-Winterboard

• A2DP - there is a hack for this, it is OS independent http://www.hackint0sh.org/f207/95485.htm#post465982
• Backgrounder - yes this works
• MMS - there is a hack for this, it is OS dependant and some people have battery life problems after installing this. http://www.hackint0sh.org/f207/93057.htm
• OpenSSH - this works
• SBSettings (realllllllly hoping this one works) - this works
• Mobile Terminal - this works

Okay, I am only responding regarding the ones I have used or know work.

Generally, you will find most apps work find and do not need to be updated between 3.0 and 3.1.2, it is where you go from 2.x to 3.x that apps break.

Hacks that require modifying system files will need to be updated, hacks that rely on mobile substrate generally work or can easily be removed again if they don't work.

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iPhone 3GS 32GB factory unlocked (3.1; Pwnagetool, Cydia, OpenSSH)
iPhone 8BG (3.1.2; Pwnagetool, Cydia, OpenSSH)