I've been waiting for this for a while... glad to see 'Crossbow' Windows Mobile 6 is almost finally here. As usual, Engadget has the breaking news.

The early reviews are in:

Among the touted improvements: Better performance, integration with Vista, search in Email, Vista-like aesthetics, bundled VoIP, improved text prediction (finally!) 

I cannot wait to upgrade my dopod 838Pro and give this a spin (assume the upgrade is supported...)

Updated: New features summarized at Jason Langridge's WebLog entry - "Windows Mobile 6 - What's New and What's Cool?"