Novation has entered the mainstream of the desktop computer music market with the launch of his two-octave MIDI controller. The ReMOTE 25 is designed for use in conjunction with a wide range of software and hardware, including sequencers such as Cubase, the Reason studio suite and Novation's own rack modules.
OS X support is announced but when?

Biac Inc. updates: Peak to 3.2 compatible X 10.2 and OS 8.6 and higher, their VST box of tricks, VBox to 1.2.
They also released SoundSoap a professional utility to remove unwanted hiss, room noise, rumble etc. It works on DV audio tracks, Powerpoint (and other presentation software soundtracks), Flash and other web-tool soundtracks, digital audio workstation tracks, cassette or other analog tape recordings that have been transferred to a computer, and other sources. It is packaged as a VST plug-in. Compatible host applications on Mac OS X currently include version 3.2 of Peak LE, Peak DV, and Peak (hey same editor, damn… ;) as well as Cubase SX. SoundSoap can be used stand alone on OSX too.

Peak 3.2 free for registered users, Vbox $99, SoundSoap $99 (VST plug-in released, stand alone coming as a free update soon)

Evolution announces the new UC-33 MIDI controler, with 33 realtime controls, including 9 faders. The range of class compliant USB keyboards also get updated with new displays and more memory (including controler memories)

Steinberg will ship Nuendo 2.0 in February, the new version has surround in mind 5:1 to 10:2, the routing of I/O has been revised to get clearer and totally customisable, and it authorize the switching between 2 configs in one keystroke. the mixer in 32 bit floating has been reengineered. VST System Link is include to distribute task between computers and network utilities now permit TCP/IP transfering of tracks and events. Import wise: Cubase SX projects, AES31, Open TL 3.0 and OMF are supported.

Nuendo 2.0: 1499 euros
upgrade: 199 euros

Sibelius release G7 a software dedicated to produce and convert guitar tablatures. Create tabs, lyrics, chord symbols and issue lead sheets or piano/vocal/guitar arrangements right away. Editing stay as simple as can be: no tools!
You can even scan tabs and have it here and now in standard notation or the reverse! Enter tabs live too (what do they mean by that?). A virtual fret board helps entering tabs directly and learn using playback. Playback covers style and bends, slides etc. An extensive guide of styles and techniques allows learning of alternative uses and is completed with tutorial material for teachers and students.
All guitar tunings and number of strings are supported and a drum pattern generator creates drum notation directly for songwriters.
Available Q1 for $149