hope official froyo available tomorrow!!! can't wait any longer!!!!!

When I on my phone, the max memory I got after killing all unnecessary apps, my memory is 144MB.
After I on the phone for say about 12hrs after that, no matter how hard I try to kill all apps, I won't be able to get back to 144MB anymore. Does anyone know why?
I'm using advanced task killer.

Guys, I was window shopping earlier and decided to finally do something about the fingerprint and oil friendly and bloody reflective SGS screen. Had a matte screen protector installed - touching and moving fingers on the screen is so much nicer now (quite shiok actually), but the noticeable rainbow effect is kinda bothersome.

Anyone can recommend a screen protector that is not reflective, non-matte if possible, anti oil and anti fingerprint without the dreaded rainbow effect?

P/S I've been told that anti-reflective SPs will be matte for sure, and will definitely have some level of rainbow effect. Even the famous Steinheil matte SP does not claim to be rainbow-free (http://www.sgpstore.com/cell-phone/samsung/galaxy-s/sgp-samsung-galaxy-s-i9000-screen-protector-steinheil-series.html).