Google Web Authoring Statistics (26 Jan 2006)
In addition to the almost ubiquitous use of href, around half of pages in the sample had at least one a element with a target attribute (determining whether these are mostly attempts to make links open in new windows or tabs or whether they are indicative of frames use would require further research; the first seems most likely, however, since frames in general aren't used much).
A lot of pages use the title attribute on a elements, which is good. On the other hand, the high frequency of occurances of onmouseover on a elements is a little worrying; presumably those are mostly cases of the status bar being overridden. If so, the fact that there are noticeably fewer onmouseout attributes in use on a elements is probably a sign of rampant bad UI. Thankfully for users, most Web browsers these days prevent the status bar from being changed by scripts.Add this article to Del.icio.us