Me too -- I love my PRS-505 (silver), but I'm getting tired of having to charge it every other time I read it. I thought about replacing the battery myself, but then I got a Kindle 3 (which I exclusively use for Kindle freebies

) and it makes the 505 screen look kind of dull and I'm getting used to the convenience of downloading with wif-fi.
I was at Target this morning and the T1s were on clearance for $65 -- I impulsively bought one of those but haven't taken it out of the box yet. I'm not sure what I'm going with the PRS-505 and I'm not even sure if I'll like the differences and whether I will get any benefits -- besides a brighter screen and wi-fi -- that will make the upgrade worthwhile.
(I'm visiting the Sony forum today to learn more about it. Normally I stay out of the device forums because they just seem to only make me want to buy new stuff.

)