As part of ReadWriteWeb's
Real-Time Summit they have put together a list of the top 50 companies that are helping to bring real-time to real life. The list contains companies frm twitter to google and
bit.ly to
tr.im allowing you to check out some great sources of real-time development.
I thought I was kinda weird that friendfeed (facebook) was off the list since it plays a huge part in the whole real-time web arena.
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Top 50 Real-Time Web Companies]