Just a quick update...
I didn't find an MS Bluetooth 6000 on the shelves of my local PC stores, but I did find one on eBay. I put in a bid of £15 and won it for that exact price (despite some cheeky sniper bidding the same amount in the closing seconds of the auction!).
Anyway, it's about as curved as I remember the 5000 corded model being. Here it is with my hand in-shot to show scale...
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Here it is next to my old, faithful, beaten-up Logitech Comfort Cordless (with the number pad sawn off). The curve on the MS isn't as pronounced as the split on the Logitech...
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And here is the MS k/b next to my iPod Touch. It took me a bit of fumbling around to establish the Bluetooth connection and then some more fumbling to find the 'External Hardware Keyboard' setting and switch it to Dvorak. But it's there, and it works...
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So, this seems to be the nearest that I can get to combining Apple's iOS, an ergonomic keyboard and the Dvorak layout. I'm going to try typing with the MS keyboard over a longer period of time to see if it's comfortable and that will influence my decision as to whether to get an iPad or not.
If I gravitate back to the comfort and familiarity of my old Logitech (as I suspect I will), then I may give up on the idea of using an iPad for portable computing and just plug my back-up Comfort Cordless into either my vintage Tosh Satellite CDT4030 laptop or the G4 iBook that I keep threatening to buy from eBay. At which point, I'll probably sell the MS Bluetooth k/b.