Here's my shortlist of companies I'm going to be watching at Mobile World Congress (including a few clients of course):
HTC-this is their coming out party. Their relationships with Microsoft and T-Mobile make them a big factor.
Google Android-now that they have the live beta dubbed the G1, expect to see lots more of what's next from these guys.
Garmin-Asus and the Nuvifone-these guys have nailed the concept of LBS/GPS and social community into a pocket sized device.
INQ-New management team, with more coming. Hot devices and very low price make these folks a real threat. High end finish and the Qualcomm chips makes them very sweet new phones.
Truphone--big news on Tuesday but mums the word.
Vringo--if video is becoming hot on the laptop, video ringtones are beginning to take off. Vringo 2.0 really works and their new Studio is key to user generated content.
Palringo-cool location based services, with full featured chat. New versions keep getting better and better. Who needs MMS when you can Palringo.