Taking advantage of temperatures

I was wondering if people are going to overclock their systems more now that temperatures are dropping. I woke up early this morning cause I was cold. Evidently a cold front came through overnight. Anyway, I fired up my system and under load the case temperature is 18 Celsius and the CPU temperature is 28 Celsius. Under load and at idle, the temperature stays the same, so I guess I'm doing something right I am running on air by the way and it is fairly quiet. I guess it would help if I listed my rig's components

Cheap FoxConn "purple button" case with some minor modification
Antec SL400 psu
Abit NF7-S rev. 2.0
unlocked Barton 3000+ 400 FSB
Swiftech MCX462 heat sink with 80 mm Panaflo
Two 80mm Panaflo case fans, (one in, one out)
ATI 9800 Pro (128mb version)
Pair of 36Gb raptors in RAID0
512mb of Crucial pc3200 (2x 256) in dual channel
one cd rom and one cd burner (forgot the names)

I clocked my 2400+ very hi (dont remomber how hi, but it was HI) last winter by sucking in air in a hose (10 cm diameter) from my window. outside temp was -44.5 c