timchuma - 12:19 am on Oct 16, 2008 (gmt 0)
Recently had to convert a large amount of videos in one batch for a site that still has dialup users, thus has a limit of 1Mb for all videos. They had to be in WMV and MOV formats. They had mostly been using 160*120 size video, but I found that they could go up to 320*240 (or broadband low-quality) for not much difference. Most of the videos where only a couple of minutes in length.