SGP Neo Hybrid (if you want to maintain slim profile, attractive design and patterns while resist from scratch.)
SGP Linear Series (same as above but is like setting a casing)
Korea iCover Dues Series (almost like Linear Series)
Mercury Case + Mercury Colour Flim (Sorry, i unable give comments since i never use it before)
Zagg invisible shield.. (Oh my don't get that, its quality worst than SGP's)
Case Mate (Sounds good resist drop/scratch while it adds some bulk)

Two cents for my reviews.

i m using neo hybrid.. be4 i get it i also thought that the silicon will cause more friction when taking out from pocket.. but it turns out that the silicon is very smooth and good to touch material.. just not the kind that u would imagine..
for me when neo hybrid is on.. its not as thin as it was.. but its a good thing to me as it has a better grip on my hand.. naked 1 is too slim n the screen is big so it felt like it is so easy to slip off my hand..
as for the protection.. i never drop be4.. so i dunno how well it can protect from that.. mine is for the purpose of scratch prevention n better grip.. the camera part is not covered but when u put the camera lens face down on a flat surface.. the lense wont have any contact with the surface thx to the thin layer of the silicon n the side plastic la.. hope u get wat i mean..
other cover let other sifus around enlighten u..

The double tapping function in settings is not the same as the double press home button function. Disabling it does not disable the double press home button.

urs is AP or SME set? jsut curious

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Added on October 21, 2011, 2:15 pm

yeah. occasional and very annoying. try go market find "homemyhome" application (comes with foxhound 2.3 and finally i can get rid of dat stupid voice command )
orelse, press carefully 

Could be a defective home key then. I feel the SGS2 home key is a bit low in quality compared to my Ace. Pressing the home key on the ace feels more solid than the SGS2.