Windows – Pausing Spotify while YouTube is playing and starting it when YouTube stops

It appears the implementation of play/pause may be bugged - or simply changed in iTunes 10 / IntelliType 8.0. I downloaded and installed the following:

http://maximized.com/freeware/scriptsforitunes/default.asp

It is a series of VBS scripts that are run with iTunes. I make no warrantee or guarantee as to their safety. Firstly, I removed mmKeys.dll, and then edited PlayPause.vbs. For case 0 and 1, instead of running iTunes.PlayPause, it works if I use iTunes.Play and iTunes.Pause respectively. I then mapped this VBS file to my play pause button. And bam! It works!

' Do the appropriate thing
select case CurState
    case 0
        ' Stopped
        iTunes.Play
    case 1
        ' Playing
        iTunes.Pause
    case 2
        ' Fast-forwarding
        iTunes.Resume
    case 3
        ' Rewinding
        iTunes.Resume
end select

I'm not sure if it will fit the bill for everything, but I have had good luck with DansGuardian It lets you set up scoring, sort of like Bayesian filtering used to block spam emails. It might be difficult to filter youtube videos, since there is little text content to work with, but it might be worth a try.