Do you use any old hacking utilities or emulators? If so, what are they? Me, I occasionally open Genecyst because of the advance-frame feature (which either doesn't exist or simply sucks on other emulators I've tried). I can't think of any old hacking tools I still use.
For what it's worth, I use SonED1 instead of SonED2, and ESE instead of ESE II. Also, I use TSDC for all my compression needs. That, and I don't use hex editors. MS-DOS editor ftw, I use it to edit smps songs, special stages layouts, object placements, savestates, uncompressed graphics, palettes, ... everything!
I don't use alot of old utilities, nor emulators, but I do use TSDC, Dega (I don't use it alot) and an old copy of Hex Workshop, but that is about it XP. Although, I still use Genecyst.
ChaoSax-Pal FTW. I just can't get enough of that point and drop color interface. Also ESE, because it has a tile editor.