Using Update Services

Regarding update services, I have two questions:

Is there any reason I shouldn’t just copy the whole list of XML-RPC Ping Services listed on http://codex.wordpress.org/Update_Services and paste it into the Update Services box in my blog’s writing Settings? (I figure more is better, but do they interfere with each other?)

Secondly, is there any way to test whether or not it’s working? Right now I just have http://rpc.pingomatic.com. I went to Technorati and did a search using the title of a recent post, but got no results.

Thanks!