Well it looks like Apple's Snow Leopard is starting to get a bad wrap as the OS that is not so compatible with alot of applications.

First it was reported that Adobe CS3 did not work but from the looks of it, it does. However Adobe is not going to be supporting it. After that was cleared up the list of non working apps started to emerge. Now some apps do work but they require some settings to be changed. Some applications require Rosetta emulations which Snow Leopard has turned off. So if your a Snow Leopard user then you might want to keep that in mind if you run into a non working app.

According to PCWorld here is a list of applications that seam to either not be working or having some issues with Snow Leopard:
Microsoft Office 2004 - for this one you need to turn on Rosetta
Backup Bouncer, Books, Boxee, Butler, Camino, CheckPoint SecureClient, ClamXav, Cocktail, ConceptDraw Pro, DataBackup, Dave, Disc Inventory X, DiskWarrior 4.1, Electricsheep, Fallout II, Flip4Mac 2.3.0.7, Forklift, Fruit Menu, Google Gears, iStat Menus, iStumbler, Leopard Cache Cleaner, Leopard Cache Cleaner, Macromedia FreeHand MX 11.0.2, MailFX Pro, MenuMeters, Mirage, NodeToad, OneSwarm, PGP Desktop, Plex, Protector Suite, QuicKeys 4.0.3, RealVNC, Reader Notifier, Apple Server Admin 10.5.3, SmartScroll, Sonos 3.0, Sticky Windows, TinkerTool, TivoDesktop, Undercover, Vectorworks, WindowShadeX, WireTap Studio, and X-Lite.

However if you really need to check out the list that is provided by wikidot:
Mac OS X 10.6 Snow Leopard Compatibility List

the list is HUGE - way to large to copy here