VirtualDJ gets updated all the times. The current version is 7.4.
For more up-to-date information, you should also check this review of the major new features, or this detailed list of the latest updates.

Basic features:

•  up to 99 independent zero-latency players with:
• Standard controls (play, pause, stop, cue)
• Pitch control with Master Tempo (from -100% to +100%)
• 3 band equalizer High, Mid, and Low with Kill and +/-30db gain
• Independent key control
•  Resonant filter
• One-click beat matching and synchronization (FAME algorithm)
•  Beat Lock engine for keeping songs in-sync and in-time
• Dynamic beat-matching visualizer
• Automatic beat-matched crossfading
• Automatic BPM and KEY calculation
• Automatic pitch matching
• Automatic audio gain matching
• Real scratch simulation
• Automatic seamless and beat-aware LOOP functionality
• Synchronized sampler with 12 instant record and playback slots
• Time-Stretch and Master Tempo Pitch algorithms
• Automatic first beat and last beat detection
• Automatic 4/4 phase detection
• Infinite number of cue points per song saved for instant recall each time the song is loaded
• Beat-aware effect plugins (included: beatgrid, flippin doubles, vocal remover, frequency filter, flanger, backspin, brake, etc...)
• VST effects compatibility (PC version Only)
• Video mix with windowed or FULL SCREEN TV output using 2nd video output
• Karaoke CDG+MP3 and/or ZIP support
• Free Frame and custom video effects
• Infinite number of video effects applied simultaneously
• DJ-specific video transition plugins
• Song database engine with easy-to-use search feature
• Cover Flow or text-only song browsing
• Compatible with iTunes playlists (iTunes DRM files not supported)
• MP3 ID3 Tag compatibility
• User-defined automatic filter folders
• Automatic Hot-Swap of external hard drives
• Ready-to-burn recording of a DJs mix to CD
• Broadcast on the Internet
• CD to MP3 encoder
• Multi-channel sound card, dual-sound card or Y-splitter output for real-time monitoring or external mixer use
• ASIO soundcard compatibility
• Core Audio soundcard compatibility
• Fully customizable skin engine and shortcut macro engine
• VDJ Script: powerful macro language used in skins, shortcuts, or controller mapping
• Compatibility and customizable mapping with most external MIDI and HID controllers (more than 80 included, many more downloadable)
• Optional automatic playlist mixing: VirtualDJ recognizes the style of the music (techno, hip hop, lounge) and adapts the mix accordingly
• Content Unlimited: search and play any song from our subscription plans with more than 15 million audio tracks, thousands of high quality video and karaoke files
•  Live Feedback: get live recommendations based on what you play and the feedback from millions of other DJs around the world