Chakra meditation theory and purpose vary depending on who you talk to.  I have compiled this list
from various sources so as to be representative of a general consensus view point.

In many schools of meditative thought, each chakra is also associated with a certain color, starting
with red at the base and going in rainbow order up through indigo at the crown.
I have chosen not to tell you what color to visualize your chakras as being.  Different
people have different associations with a given color.  Choose the color that feels right to you.

Guided Meditation: Chakra Meditation Techniques For Yoga

1) The lowest chakra, the "root chakra," is located in the perinium (between the genitals and the anus)
or at the base of the spine and it corresponds to survival, stability, self-sufficiency;
it is our foundation and physical health.
In our modern age, this chakra could correspond to not just having food and water, but also a
consistent stream of income, financial stability, and a safe home life.

2) The second chakra is in the lower abdomen between the belly button and pelvic bone.  It
corresponds to sexuality, creativity, relationships, emotions.  Problems in this chakra
could be represented by moodiness or mercurial emotions - try to limit the flow of energy
through this chakra if you're experiencing extreme emotions.  If you feel a lack of ability
to connect with people or to experience your own creativity, try to open the flow of energy.

3) The third chakra is located in the stomach between the bottom of the ribs and the belly
button.  It corresponds to self esteem, personal power, willfullness and energy.  Too much
energy flowing through this chakra could lead to over-work or pouring yourself into projects
that don't produce the desired results.  Look for balance and sound decision-making regarding
your activities to indicate health in this area.

4) The fourth chakra is located in the chest, near the heart.  It corresponds to love, trust
compassion and acceptance.  Do you give love to others joyfully?  Can you graciously
accept the love of your friends, family and romantic partners into your life?  If not, it
may point to concerns with this chakra.

5) The fifth chakra is in the throat.  It corresponds to expression, faith and communication.
How well are you able to express yourself to others, especially via words?  Can you share
your feelings or talk in front of a group?  If you are overly talkative or shy in certain settings
it may point to problems in this area.

6) The sixth chakra is on your forehead between your eyebrows.  It corresponds to intuition and intelligence.
Traditionally it also corresponds to spirituality, psychic ability and the mystical "third eye."  If you have
trouble focusing on a thought and keeping track of your ideas OR if you are closed minded
and can't see things from another's point of view, consider working on this, your "brow" chakra.

7) The seventh chakra is on the crown of your head and corresponds to devotion, selflessness, spiritual enlightenment.
When this chakra is healthy, you may feel that you can rise above all your problems so
that you can deal with them appropriately without being "brought down" by them.  You may
also feel like you are in touch with the divine forces in the world, the collective unconscious,
or what you think of as God and Heaven.  Unhappiness, isolation
or unwise decisions can be symptoms of lack of health in this chakra.

Click here to read more Chakra Meditation Techniques.