DVDRHelp have a useful table article on Video File comparisons. The table shows information on the different types of pixel resolutions of various formats including VCD, SVCD/CVD, DVD, X(S)VCD, DivX, ASF, SMR/nAVI, RM and DV.
The table also contains useful information on PAL & NTSC, video & audio compression, Video & Audio bitrate(kbit/sec), MB Size per minute, timelength, CPU usage and also overall quality. It is a useful resource when authoring in any of these formats