[portman]

This.

I vividly remember the day that I woke up and decided that from now on, I would charge $175/hr instead of $125/hr. Bookings actually increased.

Just keep raising your rates until

(a) You can't get any more gigs, or

(b) You feel too guilty to raise them anymore.

[krelian]

Just curiosity but how exactly do you market yourself? How do your clients find you?

[StavrosK]

Yep, good advice. I don't even think #2 is necessary, really...