i tihnk the biggest pluses with the GPSlim 240 are the internal battery and the built-in bluetooth.
the battery - even when it's disconnected from the PSP, the receiver still receives signal from satellites, making it easy to resume using MapThis even if you have to turn the PSP off for a few minutes, say while you grab coffee at starbucks. It's supposed to last about 10hours on its own...i haven't tried this though...the longest I've gone without recharging is about 5 hours or so.
bluetooth - I can use the GPSlim 240 with the PSP, my motorola SLVR L7, my Dell laptop running Vista and OS X. Google Earth Plus (for $20 a year) lets you use the GPSlim 240 as the receiver to give you real-time location. Did I mentioned that I can do these things all at the same time? (except running Vista or OS X, it's one or the other) The GPSlim 240 lets you use BOTH serial and bluetooth connections at the same time.
The down side is that I won't be able to play PSP games that use the GPS receiver, eh, I don't play that many games anyway. That and the fact that bluetooth is broadcasting all the time. If only there's a way to turn that off, then i think the battery life would really skyrocket.
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