It’s not just SL4B that I’ve been working on recently, I’ve been doing geeky things for SLOpenID as well.
The SLOpenID SL Maps API post on the SLOpenID blog goes into a bit of detail on the low-complexity SL Maps API replacement for the official one, so I won’t go into too much about it here. I will say it’s worth checking out if you’re a bit frustrated with the complexity of the Linden Lab API.