The Doc asks:

"What do you call a blogger who won't link? We need a name for that."

My suggestions: BlogBlagger or WebBlagger

There are currently no Google hits for BlogBlagger or WebBlagger!

Rationale: 'Blag' is UK slang for theft and/or borrowing something with no intention of paying it back. A BlogBlagger - or even just a Blagger - is someone who steals/borrows content/ideas from other bloggers without paying (linking) them back.

Here are a couple of examples of 'Blag/Blagger' from the slang dictionaries:

From A dictionary of slang - "B" - Slang and colloquialisms of the UK.

blag:
Verb. To lie or use clever talk with profit as an objective.
Noun. 1. A con, a 'scam'.
2. A violent robbery or raid.

From The Online Dictionary of Playground Slang [warning: adult language]:

Blagger : used to describe someone who is a bit of a 'pickey'. they never have their own fags,crisps and will constantly harrass someone to give them theirs instead. A bit like a sponger. can also be used to describe an action ie can I blag a fag off you.

This article is permanently linked to http://duncan.smeed.org/blogblagger and http://duncan.smeed.org/webblagger so if you wish to blink me then please use one of those. Thanks.