I download episodes of tv shows and it would be nice to give a list of shows/episodes (SxEx where SxEx is the latest S)eason E)pisode I have seen) and have it download the episode and update the list.
Has anyone written a script/plugin that does this?

eg.
show1 S01E02
show2 S03E03

after starting the downloads, the list becomes:
show1 S01E03
show2 S03E04

Say show2 S03E03 wasn't found, the list would become:
show1 S01E03
show2 S03E03