There is some very interesting post about opposite SEO or SEDD - Search Engine Deliberate Deranking (to be honest - I was shocked). 
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Megan posted this at 14:32—24th January 2007.
She has: 10,126 posts
Joined: Jun 1999
Yes, I've heard SEO people talk about this too. That post is rather incoherent to me but from what I've heard, a good SEO can get their competitors sites devalued if they want to. All you'd have to do is get your competitor associated with bad neighbourhoods and they could be banned. It is rather scary, actually.
Megan
My web design blog
MC Alister posted this at 20:47—25th January 2007.
They have: 10 posts
Joined: Jan 2007
You could maybe submit his site to a spam directory, or submit it to google a lot of times...
but i don't really know:)
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FrankR posted this at 19:25—28th January 2007.
He has: 45 posts
Joined: Oct 2006
The technique class has been around for quite some time. It is called a "Joe Job" and can be very difficult to recover from depending on how thorough the attacker was.
Frank
Author of SQL Converter for Excel, which is an Excel add-in for converting data to MySQL.
andy206uk posted this at 18:58—29th January 2007.
He has: 1,742 posts
Joined: Jul 2002
As I understand it, joe jobs are generally targeted more at email? although you're right in that a joe job is a deliberate attempt to screw someone's reputation by doing dubious things in their name...
Andyk
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void posted this at 11:33—30th January 2007.
He has: 39 posts
Joined: Oct 2006
As I doubt, do all these bad techniques really work because then how easy it will be to spoil ones reputation on the net or even if they work there must be a way to stop, avoid or detect them in some way or the other?
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DSB posted this at 17:24—1st February 2007.
He has: 9 posts
Joined: Feb 2007
I would think that they do work ~
i.e. getting your competitors website featured as exit pop up windows that you can't get rid of, using gambling etc as a keyword from gambling directories linking to them.
The thing is thought that it's not likely for two reasons:
1) Most companies don't know how to raise their own search engine rankings let alone harm those of others
2) Why not just spend the time enhancing your search engine ranking instead?
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stockapplets posted this at 13:21—2nd February 2007.
He has: 12 posts
Joined: Sep 2005
one way to harm SERPS I suffered is the use of my domain name in competitor title, so they
would rank close for people searching my domain and attract clicks this way. for example I
have site products.com and they put in title "competitor.com - products com"
many people search for domain name on google, products is not such a high competitive
term so they can rank close or better than me, so they gain lot of traffic from this scam.
but I would not recomend anyone to do this, or any other technique to harm competitors
because: competition is what makes you better
once you start even thinking "what can I do to harm them" is already lost energy that you
should be using in "what can I do better then them" It is true that you could gain on short
term from doing harm but on long term you surely loose
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StrongVibe posted this at 16:15—2nd February 2007.
They have: 14 posts
Joined: Oct 2006
why would anyone want to do this anyways?
FrankR posted this at 16:35—2nd February 2007.
He has: 45 posts
Joined: Oct 2006
There are bad people in the world that cause all sorts of grief. Someone who would do this to a competitor is scum lower than patent trolls who do not have a product of their own. Criminal is a word that comes to mind in the most egregious circumstances.
Frank
Author of SQL Converter for Excel, which is an Excel add-in for converting data to MySQL.
demopaul posted this at 08:27—6th February 2007.
They have: 102 posts
Joined: Sep 2006
I even heard a joke about Bush's site ranking first on "misfortune" request, hopefully, it's only a joke< I've never tried.