Hey it's been a while, but I remember you
Only speaking about the C128, there has been...
Hardware: Richard42 made a limited production run of a video DAC that can be used with VGA adapter to display 80-column mode on standard VGA monitor. Sold out, but an interesting read
80-Column Software: Tokra made a 640x480 video mode with 8x2 color resoultion (see here
) and another slightly smaller (and not interlaced) mode of 480x252 with higher color density of 8x1 (see here
). The images look really nice but you need 64K vRAM on a real machine (does not work in VICE).
40/80 Column software: I release beta version Media Player 128
. The GUI works in both modes and of course you can hear the audio in either mode, but the videos only play in 40-column mode.
Well I'm sure there are other things people could recommend, but those came to mind first.