Defragment and shutdown your computer. (Link fixed)

Licence Type: Freeware

Operating Systems Support: Win XP/2K

Download Link: SpeeDefrag

Developers Homepage: Vicky's Cool Software

This program restarts your pc and runs defrag program only which optimizes defragmentation speed and also it automatically shutdown your pc after completion...

So just before going to bed switch it on and in the morning you'll find your hard disk defraged and pc shutdown...

Its for Win98/Me/Xp Only.