I can't give a rating for this, because I have no computer on which to install it, but BetaNews says I must, so I give it a 4 (It's unfair to rate the program poorly, but I have not ever used it myself, although I have mostly heard praise for it)....
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Unless you just happen to either have a small-resolution screen (your own damn fault, you cheap bas****, spend a little on graphics), or you run a million programs on the systray.