One thing that drives me nuts about blogs is people who put a bunch of advertising at the top of their page. There is no useful content on the top page of the site if you are using a small monitor. At work I use dual 15″ monitors so not a lot of content displays on the screen. But the display is still 1024×768 so you would think at least some content would show up.
As an example take a look at the Smart Capitalist Blog. You will noticed the top of the page just has a list of Google text ads. If you are using a 15″ monitor like mine, then you will see no content whatsoever. I think this use of advertising is a bit of overkill. If you are going to put advertising on the top of your page, at least use a template so I can see some useful content on my screen without scrolling.
I used to read one blog every day and leave comments all of the time. I don’t want to mention the blog here lest I give it anymore publicity. They switched to a syndicated blog network which added a few ads in the middle of the screen. This was perfectly fine with me … for a while. You see, eventually, they modified the layout of the site to put the advertisements right in your face (at the top of the screen). When they did that, I removed all of my one-way links that I had setup (out of courtesy) and stopped reading the blog altogether. This is an example of the backlash people face when they get too aggressive with their advertisements.