Here at Geekzone we have all sorts of mobile devices being tested (and we post this in our review section). But there are a few that we use on a daily basis. This is a short list of products I have currently installed around here:

PDA:

Apache Pocket PC Phone Edition (CDMA EV-DO)

i-mate Jasjar Pocket PC Phone Edition (GPRS/UMTS)

i-mate Pocket PC Phone Edition (GPRS)

HP iPAQ h3970 with Windows Mobile 2003

Mobile phones:

Motorola MPx220 Windows Mobile Smartphone 2003 Second Edition

Accessories:

SD GPS for Pocket PC SSI-SDIO-1000

miniSync

iGo Presenter

Bluetooth audio:

Bluetake BT450Rx iPhono mini Bluetooth stereo headset

Bluetake Blue Ant Supertooth II

Bluetooth adapters:

Bluetake BT009M

Bluetake BT007si

DSE Bluetooth CF adapter

TDK go blue USB adapter

Bluetooth HID:

Bluetake BT500 Bluetooth mouse

Bluetooth LAN Access Point:

Bluetake BT300 Bluetooth LAN Access Point