Since this site launched about 18 months ago, I've used four different cell phones: iPhone 3G on AT&T, DROID on Verizon, LG Rumor Touch on Virgin Mobile, and LG Optimus V (Android-based) on Virgin Mobile.
My favorite phone, not surprisingly, is the LG Optimus V because it has a strong balance of features (Free GPS navigation, Android Market for apps, decent YouTube quality) and the monthly plan, including unlimited web, texts, mms, and 300 talk minutes is only $25 a month plus tax. (There's also a plan with 1200 talk minutes for $40/month.)
I started this journey before Apple's iPad came out, and now I realize that a cell phone can help education, but the real tool that will change education completely is a wireless tablet device like the iPad or the Motorola Zoom. I'm shirting my focus to tablets and education, but I'll leave this site live with occasional updates.