ADB driver essential for any android phone for development purpose. means anything that related to tweaking, ADB is important. fastboot_with_Android_usb_file.rar also has ADB inside it. But to get function, ADB driver need to be installed. n 1 more thing, extract that .rar first. phone data only affected. not sd card content

1) maybe u can sync ur contact to google account
2) donno whether link2sd will crash or not. if it crash, u may create again link2sd
3) as i said, root doesn't wipe any sd card content. if u flashing new rom, then it will wipe all data

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Added on December 30, 2011, 7:47 pm

panorama pic is a key feature for arc actually.
don't move to fast lorh. juz steady move. i prefer u to only move ur body while holding camera. not move ur camera with ur hand. that grey area appear because range u move the camera is short. panorama is best for nature shooting. not suitable for area that have people or other object as it will become distorted.

actually, every smartphone has it's pro n con. if u wan dual core, juz take sensation but if u don't care dual core n wan nice camera go to arc s. i'm using arc s n i satisfied with its overall performance. even not dual core, but it is fast also... camera software even better than sensation. so, it's all up to u.

i'm using stock camera arc s n i love it.
can zoom. try volume up n volume down