If you are looking to consolidate your devices: Cell Phone, PDA and GPS, here is definitely a strong candidate.
More information available on HTC's web site at:
http://www.htc.com/product/03-product_htctouch_cruise.htm [1]
Of course, you could also wait and see to find out what Garmin's nuvifon will turn out to be:
http://www8.garmin.com/nuvifone/ [2]
Gallery available at:
http://www8.garmin.com/buzz/nuvifone/media_gallery.jsp [3]
Links:
[1] http://www.htc.com/product/03-product_htctouch_cruise.htm
[2] http://www8.garmin.com/nuvifone/
[3] http://www8.garmin.com/buzz/nuvifone/media_gallery.jsp