All of the custom pollers are user-contributed. I try and maintain them but very short of time at the mo.
Alamy, stockfresh and canstock work for me, but it sometimes needs you to login to each site and manually refresh the pollers (the refresh button on the left) and can also depend on your language version of their site that you use.
If you know a little about regular expressions (some great tutorials on youtube) though you can build your own for your version of each site. Hit the 'Edit' button for a custom poller to see how they're built and use similar settings for your own pollers for any site you like (I have my own for gmail, for facebook notifications, for monitoring picWorkflow, and tons of other sites)