Do you think +Guy Kawasaki tweets too much?

I just started using my Twitter account last night and noticed that +Guy Kawasaki was owning my stream. I don't want to make this just about Guy though. There are tons of other people that have automated services to push out their tweets, but are they pushing too hard, or doing it just right?

Things get lost the stream easily, and most tips I read suggest that you should post links to your content multiple times to make sure your audience has a chance to see them. How many times, and how often, can you do it without being just another stream of noise?

How many tweets are too many?
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