Secondary sources...
The primary source for most "No referrer" visits is indeed type-in traffic. But that's not all.
Secondary sources for "No referrers" would include the following (and there are more, I'm sure).
1) Blocked / Disabled referrers (Norton and others do this now).
2) Bookmarks
3) Email links (Some stats programs can't handle it and call that "No Referrer")
4) Pop-ups
5) Images in email (That's a hit to your site, but no referrer is usually set - other than web based email programs like gmail, hotmail, yahoo mail and the like).
There are some others, but these are the sources for "No Referrer" that I commonly see in smaller quantities each than type-in, although collectively usually more visits are accounted for this way.
Brian.
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