I use Blender to create frames of size 1440 x 1080 @ 25 frames/sec and then do some post processing in Adobe Premiere. However, this is for movies that should look good at HD levels (HDV 1080p at 4:3).
As Felix said though, if you really want to make it look good, you should process at twice the resolution and only reduce to 1080p at the very end of your production pipeline… this would mean that you really should process at 2880 x 2160 (question is, whether your tools and hardware can handle it, really).
Both 720p and 1080p have a display aspect ratio of 16:9 and a sample aspect ratio of 1:1 (i.e. square pixels). HDTV can handle frame rates of 24, 25, 30, 24/1.001 and 30/1.001fps. 24fps is the standard frame rate of cinema movies.
For standard DVD releases you have to scale down to either 480p (NTSC) or 576p (PAL). NTSC progressive video has a frame rate of 30/1.001fps, PAL has 25fps. Both standards support 24fps video using a technique called telecine.
Both 480p and 576p formats have a horizontal resolution of 704 pixels. The sample aspect ratio of 16:9 widescreen video is 40:33 for NTSC and 16:11 for PAL. Sometimes you will see DVD movies encoded at 720 pixels width, but the additional 8 pixels on the left and right are not part of the 16:9 display area, i.e. the sample aspect ratio remains unchanged.
Prepare for more numbers than you will ever want to look at ever again…
The largest around does seem to be 1080p with 1920x1080 pixels with a 16:9 aspect ratio. Unless you know before hand specifically then rendering at this resolution (or twice as big for compositing like suggested) should have you covered for basically anything.