I've made a nice little top 10 list of the apps I think is the most essential for your mac.
Congrats to Quicksilver, the winner, my winner, the best, the most essential!
Quicksilver
Nr. 1
"amazing at everything"
CoverSutra
Nr. 2
"no fuss, only music"
Remote Buddy
Nr. 3
"fantastic app"
CandyBar
Nr. 4
"vital for my DVD- collection"
Awaken
Nr. 5
"can't wake up without it"
Disco
Nr. 6
"smokin' hot burning"
Acquisition
Nr. 7
"acquires everything"
Inquisitor X
Nr. 8
"Safari's best friend"
Transmission
Nr. 9
"torrents made easy"
VisualHub
Nr. 10
"THE best video converter"