ide: visual studio / netbeans (zip file!, almost portable)
editor: notepad++ (portable) with monaco font
file comparison: winmerge (portable)
source control: subversion, tortoise
ticket control: redmine
file manager: free commander (portable)
explorer: IE, FF (portable), chrome (portable), iron (chrom without google crap, also portable), qtweb, arora,
FF plugins: firebug, web developer, xmarks
imclient: pidgin
mail client: gmail
download manager: free download manager (portable)
sites: STACKOVERFLOW!!!, gotapi... and google, all the time...
miscelaneous: launchy (can't live without it!)
virtualization: virtual box (I have a machine image for every environment)
office: openoffice (portable)
lamp stack: xammp (portable!)
disk usage: windirstat (portable), scanner (portable)
pdf viewer: foxit (portable), sumatrapdf (portable)
uncompressor: 7-zip portable
M$ sql comparison tool: sql delta
M$ sql management: visual studio sql manager
mysql
mysql management: phpmyadmin, manager provided with mysql
uninstaller utility: revo unistaller (portable)
registry cleaner: ccleaner (portable)
ftp: filezilla (portable)
as you may have noticed, I have a special predilection for portable applications...