While I just bought an iPhone last week and love it (can't wait to chase with it!) I am concerned that the browser doesn't support tabs.
I have a slew of bookmarks for forecasting and many of these are arrays that just pull up the products - each in their own tab - Ctr-PgUp or Ctr-PgDwn to scan through (be it models going out in time, various model parameters at a given time, SPC mesoanalysis sectors, analysis arrays featuring a range of real time actual data/images, etc, text products) and firefox on a laptop is my workflow.
iPhone is great for radar, or looking a couple of critical products in the field (say a quick look at radar, sfc data, sat pic) to supplement going old school visual, but for the real heavy lifting forecasting I need tabs - and lots of them.
My old laptop still fits the bill (I reinstall the operating system each year to keep its speed up) and these new inexpensive netbooks would probably work as a good replacement when I need to.
Thanks being said, if the iPad gets Firefox with full tabs (and book mark sync - I had to export my WX bookmarks into Safari before being able to get them into the iPhone via iTunes) and full extension support, it will become a very attractive option!!
Patrick