Clarification added December 8, 2007:

O.K.
This is what is going on:
1) You have a three column TypePad blog, each column is floated left.
2) We're slipping a container, a <div>, for the banner add in after the first column, the alpha column.
3) We're giving our new div an id of "adifyad" so we can refer to it from the CSS sheet, and floating it left too.
4) Now, for simplicity, we follow the convention in the TypePad template and create a new div with the id "adifyad-inner" _inside_ our "adifyad"
div... This inner div is where we are going to paste the Javascript code that generates the banner ad.
5) Because we want adjustments to line the ad up, we simply add margins to the "adifyad-inner" div until it does line up.
6) Then we paste in the code for the ad.

Now, if you look at the code you'll see the two new divs, one contained in the other, and some inline styles to handle float and margin.

They're inline because I can't get to your stylesheet to edit it, but all you have to do is add two new CSS rules to the stylesheet:

first one:

#adifyad {
float: left;
}

second one:

#adifyad-inner {
margin: 10px 0px 10px 20px;
}

and copy the relevant two div's html code and their contained JavaScript to the appropriate places in your advanced templates in TypePad.

Not too grim, you need to be looking at about line #161.

Philip