Yep, Data plans were why I switched over to Sprint. EDGE is just waaaay too slow.you try pulling / pushing lots of e-mail on EDGE. And then if you have an attachment that you NEED to see, it's worse.
I don't blame apple for that though, it's cingular that needs to get off their butts and do something. a lot of road-warrior professionals in my area are on sprint or verizon simply because the data plans from cinular / t-mobile are way too painful and ineffective.