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Have you looked at Boogie Board Sync?

I tried it. I really wanted to like it, but the writing screen was just not bright enough for me. May be it will work for you.

I absolutely hadn't but that looks damn interesting, thanks!

What was the delay like in actual usage?

EDIT: This is literally what I was describing and have wanted for ages, US only but some ebay.co.uk vendors have them! I'm having one of these soon!