A tiny little app that happily sits on on my my menu bar but gets a lot of use with programs like CSSEdit, as I can position the code and preview perfectly on my screen in 2 clicks.

Making Safari full screen is very useful but the best feature is that it once saved me when I copied my pref files from my iMac to my MBP and iTunes 'fell off' the smaller screen. As there was no edge to the window, I had nothing to grab with my mouse. Rather than trash any prefs, all I did was select 'full screen' from SizeUp and everything fitted perfectly into place.

The asking price is what you think it's worth - so hopefully my payment contribution paid for a meal or two for the developer (well - a supersize fast food meal anyway). It is a one trick pony though, so I'd imagine that a lot of skint-flints out there will moan that this should be 100% free.

It's so great when developers can genuinely improve on Apple's superb OS without hindering the speed of the system!