Claiming profiles on behalf of clients for business listings

Hi,
manage more than 30 websites for my customers. They want me to manage there web profiles and business listings.

I just checked and for Google places, you need an unique account for each of the business.

Can someone help me how it works for these business listings websites - Yahoo Local, Bing Local , InfoUSA, Merchant Circle, Manta

Insider pages, super pages.

I greatly appreciate if there is any best practices and procedures to follow for the listings. My preference would be to use a single account to manage all my customers.
Arjee

create a fresh email account and sign up your client to all those local directories verify the listing via the email you created and your clients listing is live ,if you want to open google places listing you will need a gmail account ,for yahoo local a yahoo email and for bing a hotmail email to register your client ,i would suggest not using your clients real email when you create the citations for him or he will get spamed which can upset some clients

Contact Google. Our company dealt with the same thing and we were able to send them a bulk csv with all our client's info. Verification was still snail mail method so just tell your client to look out for that.