I use exact same method to bring my open applications. I use power pro to create such behaviour. It is an amazing program. If you want you can add modifiers like shift or ctrl+ bumping to any coordinate or edge on the screen that can be used to fire any command application etc.
http://powerpro.webeddie.com/
The way I have done is that whenever my mouse bumps top of the screen powerpro sends "win+alt" key to windows which gives me task bar.
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