[Esdee]

hmm. These are only html matters

1) There is no vertical border, it's just the cellspacing.
Now that I'm looking for it, it's also refered to as "tableinnerborderwidth"
You can just go to the postbit template and change the cellspacing="tableinnerborderwidth" with cellspacing="0"

That should do it. But then, you also lose the other 'borders'

2)If you want to insert a space between every post, all you have to do is type <br> at the end of a the postbit.

I don't know the template you'll need if you only want a space before that last table