I agree with “T.E.D.” that small, tasteful, out of the way ads are not a bother. I like the way, for example, that A List Apart does ads.
As a webmaster who has experimented with advertising quite a bit, though, I’ll share that it can be tricky matching the expectations of direct advertisers (they are looking for certain click-through rates, would like to see stats, and generally want some other information about your ad program up front), especially if you want to have repeat/long-term advertisers, and it can take up a fair amount of time lining up advertisers, agreeing on ad formats, adding, maintaining, and removing ads, and providing information about ad performance to your advertisers–at which point you’ll want to invest in some automation for, perhaps, ad rotation, ad submission, ad management, and viewing stats.
The alternative is going with an ad network, which takes most of the hassle out of it. But then you get the problem, which someone has already mentioned, of not having much control over which ads appear–and most of the time you won’t even know which ads your users are seeing. Awhile back we ran an essay on the developer.* site called “Places to Intervene in a System,” and because I used the word “essay” to describe the article in the little editor’s note that I wrote at the top, Google Adwords was constantly showing ads for those services that sell term papers to students–something I definitely do not want to support. To weed them out, I had to go edit my “block list” one advertiser at a time, and I never did get rid of all of them.
It was not long after this that I took AdWords off the site altogether, but that main reason I did that is that I could never find a way to integrate the AdWords text ads with my site such that they did not look plain ugly–a black mark on the overall page design. They were bringing in $20-$30 a month, but it just wasn’t worth it for what I felt were the negative effects.
Not long ago I pretty much did away with advertising on the site. Now I use the space to advertise the books that we publish, and to do the occassional favor or trade.
I wish you luck in making the right decision. I’ll keep reading regardless.
Best,
Dan