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It could be coming from anyone framing the site in question.
Say I were to build a frame a page right here consisting of a frame set page from search engine world, and a target frame page from webmasterworld. Someone clicks a link in the frame set page on search engine world to get to your site. Some browsers will send the frame set page (sew), and some will send the target page (ww). Thus, you don't know where the hit actual came from.
The current worst generator of bogus referral data for me; is Ask Jeeves.
Throw in home pages, indirect start pages, java script execution glitches, bookmarks, browser that block referrals, browsers that leak wrong referrals, and I think you can toss out 25% of most referral logs.
1. Someone uses a "page like this" utility?????
2. They go straight to your site after viewing a page. No physical link, but i'm convinced this is the major precursor of these mystery referrals, though its hardly a cause. Something to do with multiple browser windows open? Ive seen this happen with one of our small sites where I recognised one mystery referrer as one I had visited myself around the same time, not linked through, just typed in or visited our page through a bookmark after viewing it