Free meditation guided instructions

Free Buddhist Audio is a very good place to get free guided instruction on meditation.

My favorite is Kamalashila's "the Mindfulness of breathing"
There there levels from introduction, short lead-through, and full lead-through.
There also also Metta Bhavana , loving kindness medtiation

Here are the links:
The Mindfulness of Breathing: Introduction and Guidance
The Mindfulness of Breathing: Short Lead-through
The Mindfulness of Breathing: Full Lead-through

Metta Bhavana - Introduction and Basic Tools
Metta Bhavana - Short Lead-through
Metta Bhavana - Full Lead-through