foobar2000
Gomplayer
for those of you who arent in the know, gomplayer rocks cuz
-fastest player around, lower requirement than swan
-comes with most codecs and codec locator for missing ones (very few anyway, stuff like mastroka)
-plays incomplete files, files with broken index, and files with download in progress
-best smi support ever, lets you control everything (location, size, color, sync etc etc)
-supports m3u, pls, asx and lets you make a playlist with different file types
-fully skinable, skins are fairly easy to make
-lets you capture successive frames automatically (comes in very handy for making animated gifs)
-lets you seek thru an avi file by key frames (or # of seconds as configured by the user)
-customizable to no end (custom keyboard mouse shortcuts, VMR output, selectable full screen resolution and much more)