Well Paula, I generally check a specific string found in the body of the poem, like "on wistful horses" since, in at least once case, the plagairist actually changed the title on one of my pieces. Odds are, they won't change lines within the body. I generally use copernic (a stand alone program) for general searches, and google for more specific hits. Most don't have to worry too much, especially if most of their posted works are here in the forums. It's those who have works posted at netpoets, for instance, that routinely have to check. And that's the crux. I don't want netpoets closed down, since a rather large audience visits there, but hand in glove comes the risk of plagairism and intellectual theft.
I couldn't find a way to see the lists for Love Letters Now, but I'll send a request. Short of ponying up the $30 for full access, that seems a good option.
This is, by the by, an old topic. Other threads can be found in the members area/help pages.
Update: Tried sending a request for a complete poetry listing. Email bounced. Apparently, her mailbox is full, or she has a block against online email providers.