It's normal..there's no way you can free those ram with the stock samsung rom..you gonna have to flash to custom rom from @cowithgun or @kezra...theirs are lighter and faster

Deliver will deliver on exact date. My earpiece is loud enough, lagging problem is minimal, battery die fast only if you do gaming/voice call for long hour, RAM too low is a problem but it's due to Samsung background services, bootloop happens only if you root it and flash it to some other ROM and done wrongly else normal user no bootloop problem.
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Cut the rope lag? Never encounter before. What I did is I switched to Go Launcher EX instead of using TW Launcher. It seems the RAM usage is quite much lower after I switch to Go Launcher EX. It does peak to 300++ but after some time, android will close unused apps and free out the RAM to 210~230. Normal usage stays around 250~270. It's fun to play with the RAM. Yesterday I tried loading a web page game, pretty large in size. I think android free out most of the RAM for the flash game. After I exit 'Internet', used RAM is only 16XMB but eventually increase back after I load the launcher.
Erm... After you download facebook apps on your phone, you can choose to sync facebook contact. From there, all the birthdays should be synced into your Calendar. At least mine did. But I disabled Facebook Contact Sync since not all my facebook friends are important. Lazy to see all their birthday 

yes its normal, should detect 1 device only, unless u have multiple android device connected.

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Added on January 20, 2012, 9:56 am

from rzrecovery to cwm, do i need to restore the samsung recovery then only replace with cwm or i can direct replace rzr to cwm? how to do that?
thanks.