LYCESTRA  Thanks for the correction. I wasn't aware Apple had done that. Still makes me curious why my machine was set to 7.

Works fine on my machine so far (encryption enabled)  
(Version 1.0b1)

LYCESTRA  CAUTION: the extent of my testing (not much) shows that SmartSleep doesn't properly support encrypted disk swap. the pmset command that supports the hardware for this needs an extra bit to properly support hibernation with encrypted swap. My test: default, my 'hibernate mode' is 7. This is the combination of hibernate (1) + sleep (2) + encrypted (4). SmartSleep set it to 3 when told to sleep+hibernate, which would certainly fail to come out of hibernation properly if you have encryption enabled.

That said, Smart Sleep is a great idea.

Saving the memory to disk (hibernate) every time is a waste if you're just going to wake it up soon anyway, which doesn't use the disk. But, be forewarned that the intel-based machines don't have a small internal battery for swapping batteries so they lose power when you remove the battery. Not usually a problem, but if you don't have hibernation enabled, it will effectively reboot, having died in sleep.

If it included this warning, and fixed the issue with encryption, I'd use it.  
(Version 1.0b1)

LYCESTRA  you don't need preferences in the app. Mac OS X already handles the case where multiple apps will open the same file. You configure it by "show info" on any such file you want it to open, "Open with..." tab. And you can change it for just the single file, or all at once. And the application that will open it is the one that determines the icon.

I actually hacked one together by copying "WMV Player", changing references of WMV Player to Perian Player in file names and the PLists (so it isn't confused as another WMV Player, but is seperate new app), changing the file assocations from WM to those in the script here, and replacing icons with Perian's and the icons in this. Of course, I'm not about to distribute it. The copyright issues with Flip4mac as well as this script are all over. But it works perfectly as I'd expect it to since the binary for it just forwards to quicktime, and the plist now tells that binary (and Finder) it will open the Perian file types. And of course, you would only need one app, but each file type is handled individually in the Finder's "open as" deal.  
(Version 2.2)

LYCESTRA  Why not do what Flip4Mac does with their WMV plugin: make a new application that has all the type information, file assocations, and icons so that you get the icon and double-click open. That new application serves only as proxy, so when that app "opens" an mkv file (or whatever it may be), it actually just tells QuickTime Player to open it instead, and exits. That way you aren't modifying applications already on the system, just plugging in a contained add-on.  
(Version 2.1)