'Drive Spacio', and 'Youtube Batch Downloader'

Drive Spacio

See all your drive info at a glance -- file system, size, how much is free, allocated, cluster size, etc. Graphical representation of folders and file sizes are available in two tasty flavors: pie and bar charts. Perhaps most impressive: Drive Spacio's scan speed is comparable to commercial programs of this type. 

http://www.drivespacio.f-sw.com/

Youtube Batch Downloader

Youtube Batch Downloader automatically converts videos to mp4, wmv, or mov. Also download Individual Video with 1 Click. No more 'Save As, no more renaming to flv! You absolutely should try this application, one that supports both 32 and 64 bits operating systems.

http://eurekr.com/