To add to that list:
All Guitar Hero games except for GH1 support widescreen (so remove GH1 from your list, it supports neither widescreen nor 480p). In fact, all of the full-band games (GH:WT and newer) only support widescreen (running them on a 4:3 display with the PS2 set to 4:3 still results in the game outputting anamorphic 16:9)
All Rock Band games support widescreen as an option in the game's menu.
All of the above games also support 480p as an option in the menu.
Chip-free/MC-free homebrew <3
FMCB 1.93 on MC for emergencies, NA
250GB HDD/FHDB 1.93/OPL 0.9.2 (GSM and non-GSM)/PS2 games, NO HDDOSD
80GB HDD/FHDB 1.93/POPStarter rev12/OPL644/GSM0.37/PS1 games, NO HDDOSD
SCPH-75001 (sitting idle, slims suck):
FMCB 1.92 on MC