Here is the current list of Twitter Shush Account which I've created:

@shBBerry

For Blackberry related stuff.

@sh4SQc

For Foursquare checkins (so you can prefix your shouts). There will be probably be a sh4SQ account for general 4SQ stuff real soon - I need it.

@shEbayL

For Ebay Listings (not Ebay general chat)

@wcTalk

For WorldCup tweets (note this is an older account so it wasn't prefixed "sh")

@chatonly

Misc chat but perfect for when you tweet from live events.

If this list reaches a certain point I'll have to create a separate site and have a proper, searchable database of shushes. However, that's a nice problem to have and let's cross that bridge when we come to it :)

I've also created a Twitter list of all these shush accounts.

If you've created an account then please let me know what it is and I'll add it (please try to start all shushes with an "sh" and remember that such accounts should not tweet).