Anyone Know How To Promote Podcasts?

I've a new client who are employment discrimination solicitors (never miss an opportunity to promote a client), but do podcasts about disability discrimination etc.

I've never promoted podcasts so don't have a clue. Does anyone have any ideas how to promote them? Are there any decent directories to register them to?

Obviously the podcast issue is just one that the site faces, but it's an area they're interested in. So any pointers would be much appreciated.

Also if anyone has any sites that list:

• sex discrimination lawyers;
• race discrimination solicitors;
• disability discrimination legal advice;
• age discrimination lawyers
• discrimination based on sexual orientation

I'd be most grateful!!