I immediately decided to launch all my applications, now on leopard, this would lock up the laptop after I launched all the applications in the adobe master collection CS4 (photoshop, dreamweaver, illustrator, flash etc...). Snow leopard managed to survive up to Opera (I was opening alphabetically), that's around 80 (yes 80!) applications open at once! So that impressed me.
Out of my 200ish applications the following have compatibility problems
- Cyberduck - needs updating to the latest beta to run, the stable version doesn't open
- Coolris - not available for snow leopard yet
- Techtool delux - informs you it's not tested with snow leopard hopefully a new version will be out soon
- iStat menus - not compatible, new version should be out soon.
One last thing of note, snow leopard only contains java 6 (both 32 and 64 bit), leopard contains java 5 as well, if you're a java developer you may want to take note of that (I use java 5 for my degree work).
All in all it's pretty, faster, but nothing too flashy, for 99 NZD for a family pack, I'd say it's worth it.