Down from Page Rank 3 to 0

ask Google.

Page rank is about much more than what application you have running your site. Check your backlinks, for example.

http://www.iwebtool.com/backlink_checker?domain=jawed.info

no i dont. the content of a site that links to you is only used to determine whether or not the link is in context to what is being linked to — in other words.

You have site about birds. Do other sites about birds link to you?

Yes: Google likes that, and PR might be positively affected

No: Google doesnt care, and PR probably wont be positively affected BUT WONT BE negatively affected.

Do you understand the difference?

Google doesnt punish sites for who links to them.

Youre also confusing a backlink with a comment within a link, and thats NOT the same either.

A backlink is someone that Links to you.

A link left on your site via a spam trackback or comment is a link from you to them — and thats a backlink for them, NOT you.

Does Google punish sites that link to known shit sites? I have no clue, not do I care to. I take care of my spam, and always have. Thats part of being a responsible web master, regardless of the web application I use.

link to site?

(This isn’t a wp thing)

Couple of things which I can think of which might have caused it.

You have two index files in your root directory (like an index.html and index.php)
You gathered an obscene amount of backlinks in a relativly quick and unnatural method. (blanket directory submissions)
You bought the domain off of someone and the transfer downgrade is just being implemented.
Black Hat SEO i.e. cloaking, hidden text, keyword stuffing… etc.
Any number of reasons…

Pretty much the same as they work with any blogging platform.

http://codex.wordpress.org/Introduction_to_Blogging#Trackbacks