Here's a list of my most frequently used progs - mainly productivity, web, video and music...
- Office 2004 (2 original Disks for 2,50$/10$ at the bay) with OpenXML-Converter (free)
- Skim PDF-editor
- CombinePDFs (free version)
- TaskPaper1.0 (free)
- webkit for Leopard with ClickToPlugin
- Paintbrush
- CorePlayer / VLC / mPlayerX / mPlayerX Ext
- YouView (YT-videos with optional Safari-extension)
- Onyx / TinkerTool
- AppCleaner
My most used/essential paid software:
- CarbonCopyCloner / SuperDuper!
- Office 2008
- DEVONthinkPro (collect data, convert to searchable PDF in the background)
- PageSender (GroupFax!&Mail)
- Moom (customizes the green button for resize windows)
- G4FanControll (adapts the temperatur-threshhold of the harddisk for mSATA)
- SOHO-Organizer (synchronizes with iCloud Calender and Contacts)
- iVCD (to play my 15y old SVCD collection)
- VirtualPC7 and Win2k (mainly to run irfanwiew and old peripherals (scanner) or software (TMPEGence etc.), but to be honest: it's just because I want to be able to use it - just in case)
As for Photoshop: got both a cheap PS7 for MacOS9/Classic and the CS1 update, so I can run it on MacOS9, Tiger-Classic and Leopard
My most used software from Apple:
- iTunes (connects to iTunes in the Cloud and local libraries)
- Email-Client
- iPhoto
Most often used connectivity tools:
- webDAV (Finder/GoTo/ConnectToServer: https:/webdav. ... )
- Dropbox
- FileSharing (with Finder in my home network)
- FileSharing (with Finder in my office's windows network)
- ScreenSharing (with Finder in my home network)
- VNC (connect to Win2008-server, since MS-RDP-Client isn't supported anymore )
- RemoteDesktop with Windows with (MS RDP-Client)
- TeamViewer7
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Teleport is really neat if you have more than one PPC Mac, it allows you to control (and share copy/paste) multiple Macs with one keyboard and mouse. Helpful for keeping your desk uncluttered. 
I'll update this if I remember any more, I'm not using any of my PPCs at the moment to check.
Yes, Teleport is great! I've used it a while with two iMacs sitting site-by-side on the desk but then I gave up that combination.
SynergyKM works quite similar, as far as I remember...