Body Scans:

Long body scan, about 40 minutes (Ken):
BodyScan
Long body scan, about 35 minutes (Liz):
LizBodyScan
Short body scan, about 10 minutes (Ken):
ShortBodyScan
Short body scan, about 15 minutes (Liz):
LizShortBodyScan


Sitting meditations:

Short breath meditation, about 10 minutes (Ken):
10MinGuidedMeditation
Breath meditation, about 20 minutes (Ken):
ShortGuidedMeditation
Long breath meditation, about 30 mins plus 4 mins prep (Ken):
SittingMeditation
Breath meditation, about 20 minutes (Liz):
Liz M

Other practices:

Loving Kindness Meditation, 21 minutes (Ken)
LovingKindnessMeditation
Three step breathing space (Ken)
ThreeStepBreathingSpace

Other sources:

Great set of meditations from Bangor University

Frantic World Meditations

Mindful Health guided meditations (includes sitting, body scan and yoga)