Sonoma Wire Works has launched FourTrack (App Store link), a multitrack audio recorder for the iPhone and iPod touch (2nd Generation).
FourTrack works with the iPhone built-in microphone, a headset mic or an iPod touch with a third-party mic and headphones.
WiFi sync allows FourTrack recordings to be downloaded to any desktop computer with a browser. Tracks can then be loaded [...]

I’m an iPhone fan - but Windows Mobile is an established platform and there are some interesting music apps coming out for it, too.
MeTeoR is a digital multi-track recorder designed specifically for the Pocket PC. The program features up to 12 tracks of audio, a built-in mixer and multi-effects processor.
MeTeoR is designed for creating musical [...]

Numark has introduced the iDEC, a professional rack-mount solution offering playback and recording for iPod.
iDEC’s Universal Dock for iPod permits playback of audio and video from any docking iPod through integrated outputs. It can also record incoming audio in real time at CD-quality 44.1 kHz sampling rate, directly to the docked iPod.
The Numark iDec is [...]

At the 2008 Winter NAMM Show, BOSS announced the BR-900CD Version 2.
With Version 2., BOSS has added the GT-Pro quality COSM guitar amp model, a new drum-editing software application (downloadable from the web), and 500 minutes of recording time via 1GB Compact Flash.
The BR-900CD features an 8-track recorder with phantom-powered mic inputs and built-in CD [...]

2008 NAMM Show: Roland anounced the new CD-2e SD/CD recorder.
With high-performance stereo-speaker, stereo mic, and CD-R/RW drive built-in, the CD-2e offers out-of-the-box recording capability. Weighing in at less than 3 lbs (less than most laptops), measuring 2 inches thick, and having the ability to run on six AA batteries, the CD-2e is an extremely portable [...]