2 columns

Hmm, it is not really built in…

What you can do is use CSS, and give each uneven entry a float:left, and each even entry a float:right.
Then give each entry a fixed width and maybe height.
It will look like this:

1     2
3     4
5     6

What is also possible, but only with current SVN, is have all the .gwolle-gb-count_1 entries have a float left. And when you list maybe 20 entries, to have .gwolle-gb-count_11 and further a float right. Then give them a fixed width.
That could look like this:

1      4
2      5
3      6