Google Mobile - GMail
I just installed this on my Motorola V551 phone and was very impressed. In just a few short minutes I was viewing my GMail inbox and looking at the contents of Word and PDF document attachments on the phones small screen.
Google really seems to get the small screen mobile application space. When I look in my phone menu, I see: Google Local, Google Maps, and now GMail. I anxiously am awaiting a Google Calendar app for Java phones.
I am going to be looking to upgrade to a WM 5.0 Smartphone soon, something with a QWERTY keyboard, and I can see these apps being a mainstay of my mobile life in the future.
Way to go Google!