Not all of the following are freeware, but I have compiled portable versions of them all. They may not be the smallest but they do the trick for me.
Ad-Aware - Anti-spyware program. Slow scanning but pretty good program.
AIMP Player - Not the most feature-rich but it is lightweight and easy-to-use.
Anti-Malware - One of the best spyware and virus removers I've
SUPERAntiSpyware - Not the best real-time protection but excellent scanning.
SpywareBlaster - Anti-spyware but safe guarding critical files. Run it and then close.
BonkEnc - Music ripping program. Easy to use and pretty fast in my opinion.
CCleaner - File cleaner, registry cleaner, startup manager, uninstaller and it's tiny.
ClamWin - Free anti-virus program. Meant purely for scannng, not protecting.
Disk Cleaner - File cleaner. Scans HDD and you choose what to remove. Small, too.
Firefox - The best browser out there. Fast, secure and you can add stuff with addons.
FrostWire - Just like LimeWire Pro, but completely free. Better results, faster downloads.
GetRight - Fast and easy-to-use download manager. Better than Free Download Manager.
JkDefrag - The best defragmenter purely because it's one-click-go. Small and fast.
Registry Mechanic - Do I really need to say why this program is on the list? Seriously.
mp3DirectCut - Make your own ringtones using this small and simple audio cropper.
nCleaner - Another file cleaner, like CCleaner, but a little bigger. Still fast though.
Paint.NET - Make pics B&W, change hue, contrast, brightness, fix red-eye, rotate. etc.
Spybot S&D - Anti-spyware app aimed more towards visible spyware like toolbars.
TuneUp Utilities - All-In-One program to speed up, clean and repair erros on your system.
Revo Uninstaller - Uninstall programs, then scan and remove the crap the uninstallers left.
Unlocker - Good for removing stubborn malware or files that are locked and can't be deleted.
uTorrent - Small, fast torrent downloader. One alternative may be Halite but I like uTorrent.
VideoGet - Download videos from YouTube, MetaCafe, Break, Ebaum's World, etc.
Spybot portable has a bigger and better hit and clean statistics, also bigger signature base.
Foobar uses less resources than AIMP, it also has a dataabse.
you use too much reduddant programs for the same task.
bonkenc is good
ccleaner is good
ccleaner does what disk cleaner does
firefox is NOT portable. i don't care what other people say. it doesn't restrict itself to the directory. you need to thinapp it. I use thinapped firefox.
Frostwire is not portable. use emule.
getright must be thinstalled.
jkdefrag is ok.
delinv is better that unlocker after many trial and errors.