I, like many others, only use the guides as a guide. I have always viewed the prices as dollars and indeed tended to subtract the VAT when buying. I much prefer the Goldmine and Osbournes guides when buying though .
An online guide will be very useful, I assume it will be via subscription John?
I'd really like to be able to download the data to a PDA rather than carry a guide about my own excel wants list on my PDA is limited in terms of info and has what I am willing to pay rather than a 'guide' price. Not sure if type of functionality is feasable? I'm sure you would need to make sure it was secure or there would be hooky copies of the data in no time at all but it would be worth buying for sure.
In an ideal world price guides wouldn't exist at all but you can't uninvent them mind you in an ideal world it would be $4 to £1 and I would be the only buyer on ebay