d bkkeepr ISBN nick start = add NICK for each book to switch easily

For starters, I haven't really used your superb sounding service yet, but 2 seconds after reading the available commands on the bkkeepr site I was thinking about a v.similar idea to this and wasn't surprised to see this here already mentioned... I think using a 13 digit ISBN number is "a bit" cumbersome and places a much higher effort (time & cognitive) on the act of bookmarking, compared to just using a nickname/alias for a book. I don't know how many books your average user is reading in parallel, but personally it's not more than 3-4 and I can well remember the exact spelling of this number of aliases. I can't say the same for a ISBN though, which I'd have to look up every single time (also more effort to type on mobile phones; I'm mainly reading on the tube). With aliases I'd have the freedom to be as short as I'd like (I'd probably just use "wp" for your "war and peace" example...)

Also, if you're so worried about misspellings, maybe there could be another command which lists all aliases of currently active books? What do you think?

In any how, I look forward giving bkkeepr a spin. It's a great & inspirational idea for using twitter productively...

Dealing with multiple ISBNs has been my largest frustration - I usually have 2-3 books going at once, and it's tiring typing in the ISBNs each time (usually screwing it up). I've been cut-and-pasting from previous sent-messages, but that is a PITA.

One possibility - using the last 4 digits of the ISBN as a nick - it's unlikely that any set of active books would have the same last 4 digits, and it could work automatically just as page refs without the ISBN for single books do.

So you'd do 978123456789 start
Then 6789 65
Then 6789 end

(Or even 5 digits, for greater disambiguation. I can remember (and type!) 5 digits a lot more easily than the full span.)