ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
Momixa - Pick two songs and get the perfect mix
cassini - Polyphonic Synthesizer for iPhone/iPod touch
Liveset Database - Database site with tracklists from Dj sets
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins