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I think Microsoft adcenter is possibly one of the most commonly overlooked methods of increasing your sales with practically no actual thought. I've used them successfully since I've started and they've always brought in some nice extra income for me. 
The thing I dont get is how they do the demographic research. I guess since adcenter is associated with Microsoft which is about ~90%+ (estimation) of all people online, they can somehow tell what demographics are viewing their advertisements. My other guess is that they are using the Live Toolbar to get these stats.
Get this, you can target your traffic by age (no idea how they get this information), geographic location, time of day, and even gender (again, no idea how they're getting that information).
I question how accurate the demographics are, but hey increase is increase.
I think things like this can be especially helpful when promoting things such as dating or other gender specific niches. Generally, you're going to want to say, "Find the woman of your dreams" and have a male find it. I'm sure the woman looking for Mr. Right is not looking for a woman of her dreams.
No other search engine can boast doing that... for now at least.
For those of you not using it, I highly recommend it. Why? Because it's extra traffic for a fraction of the cost of google.
How are the conversions?
You'll see my posts on Adcenter on Digitalpoint have always been in favor that Adcenter's conversions were always par or better. In fact I used Adcenter to keep some campaigns going in the profit while I tried to figure out how to make the adwords campaign profitable.
Overall, I generally use the same keywords from my other campaigns and just transfer them over to adcenter. It seems to work well enough.
EDIT: I wanted to add what I dont like about Adcenter.
While I like the service a lot, I HATE the interface and I think most will agree, it's VERY "clunky." That loading bar seems to be spinning 100% of the time while I'm on that site. While it does bother me quite a bit, it's not enough to stop me from making extra money. 
Just had to add that little bit.
This was another post on my "instant increase" series.
To read the other posts in this series, please view the posts below:
- "But I have nothing to write about"
- Negative Keyword List To Increase Profits.
- GEO Target Your Landing Page.
Thanks,
Jonathan Volk
Wow man, you really think so? I think AdCenter sucks balls. In fact, I wrote a post about it not too long ago. When I started out with Ringtones, I used them and it was OK but still nothing to write home about. Perhaps I’m missing something.
[...] So you know how I wrote that post about how AdCenter is Sucking Harder Than a Dyson vacuum cleaner? Well, it seems that my friend Jonathan Volk disagrees and since I have made it my job to keep you guys informed (hopefully without too much bias), I felt it necessary to inform you of what he thinks. So take a moment to read about why Microsoft Adcenter might not suck as hard as I thought. [...]
Adcenter gets their data from people that fill out user profiles on their MSN, Hotmail, etc. accounts.
I like the cheap clicks on Adcenter, but my continuing beef with them is that they disable keywords seemingly at random. I had the keyword for a brand name disabled when that was the very product I was selling on the site – just one example. Sure, a call gets them back up, but who wants to do that every couple days.
Most of my markets are smaller niches though, so maybe if I was shooting at some seriously high-traffic phrases…
I’ve had some pretty good luck with them as well. I totally agree with the interface because it’s slow and I’m so sick an tired of watching the graphic spin while waiting for my campaign data to come up.
Honestly I’m really surprised as to why neither Microsoft or Yahoo has built an external editor similar to Google Adwords Editor. If you make your product easier and more efficient for your customers to use then more than likely they will spend more money with you.
[...] my last post about Microsoft Adcenter, I’ve been asked quite a few times about some of the things I do to [...]
Actually, I’ve used adcenter in the past and found the system cumbersome and obscure at best.
Maybe I will take a new look at it after your comments.
I just started using MSN ad center, it is a pain but hey traffic is traffic. The more traffic the more $$, why only use Google and Yahoo when you can give yourself a pay increase for a little extra work on MSN AD CENTER.