My most used tools:
All: UltraEdit, Firefox and Excel
Crypto: SCBSolver, WinDecrypto and Cryptool
Programming: C# and javascript
Stegano: IrfanView, steganabara, Audacity and Paint.NET
Crackit: PEid, IDA Pro, jad and SmartCheck
Flash: Flare and Flasm
Browser: HTMLheaders, Firebug
Less used:
Perl, AZPR, Apache, PHP, Cain, PaintShopPro, GnuPG, Goldwave, Immunity Debugger, Python, Sokosolve, Stecos Barcode, Lisp, VB Decompiler, SpectroGram, OllyDbg, John the Ripper, de-crypt.co.uk, LordPE, Reflector, TweakPNG, VMware, winRar, yenc32