There are many ways you can help if you are interested in seeing the XHTML Friends Network grow and become even more useful...
<a href="http://gmpg.org/xfn">
<img src="xfn-btn.gif" alt="XFN Friendly" />
</a>
rel='friend'
to your blogroll, then maybe they would be interested into reciprocating and doing the same for you. How about suggesting to them that they add XFN to their blogroll?
There are also many opportunities to build little components or bits of code that do interesting things with XFN. An advanced XFN builder could present a grid to edit a set of friends all at once, e.g. to set all co-workers to merely be colleagues, or select a whole bunch of people and indicate that you met them (perhaps all at the same event).