Hello,
Just in case some other wikipedias are interested, too:
In the german wikipedia we started an experimental web of trust
yesterday. It works by the "what links here functionality". A user who
wants to participate creates a page [[User:Name/trust]] and lists there
all the people he trusts in the form [[User:Otheruser/trust]]. By
visiting a trust page (existing or not) and clicking on "what links
here" you can see which people are trusting this user.
A description in german can be found at
http://de.wikipedia.org/wiki/Wikipedia:Vertrauensnetz
An example page is at
http://de.wikipedia.org/wiki/Benutzer:Elian/Vertrauen
greetings,
elian
PS: english wikipedia has a page
<http://en.wikipedia.org/wiki/Wikipedia:Trust_network> with another
proposal.