Pictured below (more pics after the jump), the iPaq 510 Voice Messenger features (of course) Windows Mobile 6 Standard, integrated b/g WiFi and HP's own VOIP client.
Specs are pretty standard for this type of device - the iVM packs the perennial 200MHz TI OMAP processor, 128MB ROM / 64MB RAM, microSD expansion, a 1.3 megapixel camera and Quadband GSM EDGE. The real bad news? The screen is running at 176x220, pushing the iVM into the 'old tech' category with the HTC S310.
Of course, the killer could be the price with such average specs, but then, iPaqs aren't know for being cheap are they...
[Update: Reviewed already by Laptop Magazine here!]