I have many of the well known ones, like Transmit, Coda, Adium, Caffeine, iStatMenus, MacPilot, MAMP etc.
I like useful little apps like Caffeine and that sort of thing.
I've also purchased a small little app called 'Cinch' which gives the Windows 7 snap feature, I like it, and some of you may be interested =P
So, what apps would you recommend for me? =P