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I wrote the e-mail in true PR style -- helping the Guide with useful information about a site that their visitors might like, and naming the stand-out, unique and newsworthy features that made it worth mentioning in the face of all the other sites in the category.
The site got a short complementary write-up three weeks later that brought good traffic -- a stable link in the section, for free -- and search listing.
The section Guides are basically reporters. They always need good new content to retain their audience, so it's worth a try. You might even get mentioned in their newsletter.
This is an up front commercial site -- all about sales with only a few informational pages. In fact I've been trying to get the client to come up with more information -- it would help a lot for better placement on many engines and directories.