Portable Apps is a site I came across a whiles back. Its great because you can put the programs on a flash drive so you can take it with you wherever you go. What the best thing about this is that it is free and open source at that. What is nice is that they keep adding more programs to the site. If something has been updated, then they just changed the version number. A lot of the programs that are available are good. There are some that are not that good and yet others are wonderful on what they do.  Below is what is available at the site.  You also need to download a suite so that you can load up the programs on your flash drive.  When you do use it, it comes up on the right side of your computer and you can access the programs like you do on your start menu.

• Firefox Accessibility Extension
• On-Screen Keyboard Portable
• Virtual Magnifying Glass Portable

• BPBible Portable
• Celestia Portable
• Stellarium Portable

• Cornice Portable
• GIMP Portable

• Notepad++ Portable
• Nvu Portable & KompoZer Portable
• XAMPP
  

• DOSBox Portable
• Frets on Fire Portable
• Jooleem Portable
• LBreakout2 Portable
• Mines-Perfect Portable
• PokerTH Portable
• Sudoku Portable

• Mac-on-Stick
  

• Audacity Portable
• BonkEnc Portable
• CoolPlayer+ Portable
• DVDStyler Portable
• MPlayer Portable
• VirtualDub Portable
• VLC Media Player Portable

• aMSN Portable
• DownThemAll! Extension (for Firefox)
• FileZilla Portable
• FireFTP Extension (for Firefox)
• Miranda IM Portable
• Mozilla Firefox, Portable Edition
• Mozilla Thunderbird, Portable Edition
• Nvu Portable & KompoZer Portable
• Pidgin Portable
• PuTTY Portable
• Sage Extension (for Firefox)
• WinSCP Portable
• WinWGet Portable
  

• 7-Zip Portable
• ClamWin Portable
• Command Prompt Portable
• ConvertAll Portable
• Eraser Portable
• InfraRecorder Portable
  
• JkDefrag Portable
• KeePass Password Safe Portable
• Lightscreen Portabl
• PeaZip Portable
• PortableApps.com AppCompactor
• PortableApps.com Backup
• PortableApps.com Menu
• Toucan
  
• WinDirStat Portable
• winMd5Sum Portable
• WinMerge Portable
• Xenon File Manager Portable

• AbiWord Portable
• GnuCash Portable
• Lightning Extension (for Thunderbird)
• Mozilla Sunbird, Portable Edition
• Mozilla Thunderbird, Portable Edition (Address Book)
• OpenOffice.org Portable
• PDFTK Builder Portable
• PNotes Portable
• SpeedCrunch Portable
• Sumatra PDF Portable
• Task Coach Portable

As you can tell, there is a lot of different programs to try. I have tried a lot of them but as they add more, sometimes it is not possible to try them all.  Most of what I have used is in in the internet, utilities and graphics sections.