If you're thinking of looking at an x86-based tablet, you might want to do a search on
"Burt Keely" tablet
to see some really slick tablet users in action ... from 2001-2006 era! It'll give you some much-needed perspective on the last decade of non-Apple research paving the way for the 'new' tablet industry.
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If you're going to get a convertible tablet/notebook, look for a 1400×1050 resoution (vs the other Microsoft-approved tablet resolution of 1024×768, which is FAR FAR more common). The 2006-vintage Fujitsu t4215 I serendipitously aquired has the hard-to-find 1400×1050 resolution.
Having used 1400 × 1050 for 6 months, I'd NEVER go smaller. Web designers no longer design pages for a browser window only 768 pixels wide. The 2011 web is 1024 pixels wide, baby. Every once in a while I down-res to 1024 tall × 768 wide for as long as I can take it—minutes, not hours. 768 width makes me
pitty da fools with iSteve/XOOM/etc trying to surf comfortably in 768-pixel wide portrait mode.
Cynically I wonder some days if the iSteve is going to hold back web design, by reaffirming a 768-pixel web page width.
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Thinkpads make an excellent platform for Linux—consider looking at a new or used ThinkPad tablet convertible if you're stuck to Linux.