Lithium Polymers shouldn't explode as easily and have a longer shelf life (but not dramatically longer).

Oh, and they can be made into exciting new shapes no battery has had before!!! (Sorry, I'm not very good at Marketing Speak)

I replaced the lithium-ion battery in my T3 with a lithium-polymer. The latter is moldable to some extent, so I could fit a larger-capacity battery by shaping it (a bit like very tough clay).

Electronically the li-po are the same as a lithium-ion batteries, w.r.t. charging/overcharging/undercharging etc.

Had to get an internal overcharging protector installed though, as this was an RC battery - they are sold "raw".

@spiderx: Good summary! I've been going on and on about lithium batteries for several months here, but your shortlist got it all I think. I tend to waste much more space..