www.google.com/mobile
www.google.com/gmm - Google Maps Mobile
www.mgmaps.com - Download Maps
www.mobile.yahoo.com
www.mobile.yahoo.com/messenger - Yahoo Mobile Messenger
www.enpocket.com
www.go2.com
www.jumptap.com
www4info.com
www.medio.com
Mobile Ad Networks - Content on the Run
www.avantgo.com
www.adhoc.com
www.admob.com
www.mophap.com
www.thirdscreenmedia.com
Don't forget to check out all the .mobi domains if you are a company and want to develop a site for mobile media.
Great article on "TV for your handheld". Still not there yet in its truest form...
http://www.mediabistro.com/content/mobile/tv_on_your_handheld_its_finally_here_but_is_there_anything_on_54130.asp
Have fun!
HP