[foob]

It works great and looks very useful, but there is one thing that you might want to change. Your example is "Startups, Google, Apple" but when you enter this string it actually adds "Startups,", "Google,", and "Apple". It would be more intuitive if you break the entry up into separate tags removing ", " or "," instead of just " ".

Edit: You might also consider clearing the text box after adding a tag. It felt a bit awkward having to hit ctrl-a before typing each time I wanted to enter something new.