QUOTE(milkycreamo @ Jul 16 2010, 01:26 AM)
can anyone list down best apps. that must have in galaxy s? and anyone knw how to make galaxy s perform faster?
thanks

There is no must have apps actually. But what would really suit your specific needs.
What I do recommend is ATK if you can do the right settings.
Handcent SMS , instead of using the stock android SMS system -> You can use ringdroid to 'remind' you that you have unread SMS, which is great.
Ringdroid for people who want custom ringtones/SMS notifications edited from their songs
Some widgets for quick toggle settings from curvefish that I posted earlier
A digital clock and calendar widget
Agenda widget that links your schedule to whichever homescreen you want
And I prefer FXcamera over the stock camera app, and it's fun too.
Android system info for people who want to know what their phone is up to.