Great thread and thanks for reviving it. What I noticed about Mac is that Apple has a way to do something and everyone accepts it. Unfortunately coming from Windows and/or Linux - there are things I like to do with shortcuts and I have searched far and wide for replacements. Below are what I have found - and hopefully others find it useful.
Better Touch Tool
Better multi monitor & multitouch experience for Mac OS X by Andreas Hegenberg SecondBar & BetterTouchTool Blog
It makes magic mice and touchpads even better. Configure gestures to do anything - expose, application expose, open dashboard, open spaces, open an app - you name it. Instead of assigning a hotkey - you can assign a gesture. Plus with the latest version you get that windows 7 easy tile functionality - works pretty well. See this youtube video to see the windows 7 version.
YouTube - Windows 7 Snap TV Commercial
From what I found searching - to do stuff like tiling windows for Mac took an apple script.
Added bonus from the same guy is secondbar - when you have two monitors you can put a menu bar on both screens.
Zooom2
Zooom/2: Window management for your Mac made easy
This one costs money but I like the ability to move windows without having to click the title bar. Standard function in a linux windows manager. Zooom2 also adds magnetics to your move. Something else that also comes standard with linux. It also provides windows resize with hotkeys of your choosing. $20 is steep for something that has been around forever on linux.
As stated before - Quicksilver. RTFM but I use it to launch my applications - it is the fastest way to launch a program.
Blacktree
Show All and Better Touch tool
I configured hide all windows in Better Touch tool to be a 5 finger swipe down. I wanted a show all windows gesture to be 5 finger swipe up. I noticed that hide all windows was available but show all windows wasn't. Show all windows is a command under the application menu. To get this all to work I had to assign a hotkey to Show All. To do this Go to System Preferences -> Keyboard -> Keyboard Shortcuts -> Select Application Shortcuts -> hit the + button and add Show All. I assigned it ctrl-alt-cmd-h -> You can then assign this hotkey to 5 finger swipe (or whatever) in Better Touch Tool.