If its just for business apps you might be able to get away with an ultra portable.
I know you said no macs, but what about BootCamp to run XP or Vista natively, it is literally a PC afterall, just with another operating system also installed. I was thinking the Macbook Air would give you a big screen for a light weight.
Dell's are always a solid choice, great customer care and it's easy to strip them down and rebuild them should something fail/break.
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"Punk rock had this cool, political personal message. It was a bit more cerebral than just stupid cock rock, you know"
-Kurt Cobain
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