Low-impact portable apps?

Do any of the programs at The Portable Freeware Collection write to the drive heavily?

I have a Kingston DTI/1GB USB 2.0 Hi-speed flash drive. So far, I've loaded the following apps:

• PStart
• AbiWord Portable
• Foxit PDF Reader
• VLC Media Player Portable
• ImgBurn
• Avira UnErase Personal
• CPU-Z
• CCleaner Portable
• Unstoppable Copier
• Windows Worms Doors Cleaner
• Mozilla Thunderbird, Portable Edition
• Mozilla Firefox, Portable Edition
• AleJenJes Countdown Timer
• Notepad++
• Dark Room
• Ant Movie Catalog

I haven't found a lot of descriptive posts or articles that discuss wear and tear on USB flash drives. If you could link to some, that'd be perfect, actually.

Sort of related, does using IMAP with Thunderbird Portable write to the drive a lot?

Thanks!