If you haven’t heard of tac, it’s a pretty nifty command-line utility that ships with the GNU utils and it’s used to print a file backwards, line-by-line. It’s especially useful when analyzing things like log files, and judicious use of tac can speed up commands considerably.
Take the example of a 30GiB webserver access log and you want to see the last request to a certain resource or that triggered a particular HTTP status code. You could run the following to get the last such request… which would take quite awhile on anything larger than a few hundred MiB:
> egrep "GET /path/to/resource " access.log | tail -n1
Or you could be smart about it and use tac instead, and not even have time to blink before the result comes back:
> tac access.log | egrep "GET /path/to/resource " | head -n1
If you’re still stuck on .NET 2.0, 3.0, or 3.5 for any reason and don’t have access to the 
If you have any skin invested in the high-performance computing game, you’ve almost certainly heard of the likes of MMX and SSE, the original “extensions” to the x86 assembly instruction set that provided task-specific performance-optimized instructions that let developers take advantage of specific hardware extensions to quickly perform tasks that previously required extra steps in software to compute. If you haven’t, here’s a quick briefer.
We’ve just released the inevitable bugfix build for any product launch with Easy Window Switcher 1.0.1, which adds the ability to cycle between maximized windows. Hat-tip to Chris Bollman 
