Looking for a "window thumbs dock" kind of tool.

[Magicloud Magiclouds]

Hi, all,
  Say I have a few windows running some jobs.
  But if I left the window on the desktop, it took places and block other
windows. If I iconified it, then I could not lazily take a glance at it to
see if anything happened.
  So, is there a tool that like a dock bar to stay at the side of the
screen (better to hold the place, so maxed window could not cover or be
covered), and I could let some windows be "in" it, and it shows the thumbs
of the current contents of the windows?
-- 
竹密岂妨流水过
山高哪阻野云飞

And for G+, please use magiclouds#gmail.com.
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