| If you're using it for anything more than note taking, you're not going to get 5 - 7 hours of battery life with a single battery. I've generally found that running the CPU flat out will reduce the battery life to somewhere between a 1/4 to 1/2 of it's 'normal' capacity.
Coding generally requires a high resolution screen, and the Toshiba you were looking at can only manage 1024x768. Whilst that can suffice, obviously I don't know what IDE you're working in, and how well it'll manage in that resolution.
All Centrino laptops use the same wireless card (It's part of the Centrino name), which will provide your basic 802.11b wireless connection.
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