Shoutbox

At one stage I had a go at something like this.  How I went about it was comparing the date that the script was imported and seeing if there is any updates to that script that happened after that date.

This method is flawed and won't give any updates that might have occured before installing, but it is at least something.

This with something that compares the version numbering that people have now should work well (at least in theory).

Though it would be better to have a more uniform system.... (but you should allow A or B or RC<number> as well IMHO)