Two Column Themes
Blog It 750 is a minimalistic two column theme with a sidebar big enough to hold two 125 x 125 banner ads. The theme is available in white and blue, black and blue, & black and red colors.
RC2 is a lightweight 2 column theme with a top bar. The theme is simplistic and is widget ready. The theme loads quite fast since it uses minimal images both in the background as well as the page.
Excel is a two column theme which sticks to a strict horizontal grid. The theme has rotating header images, post ad integration, author comment styling and built in separated comments and trackbacks.
LouiseBrooks is a fixed-width, 2 column with right sidebar theme, with a little Deco styling. The theme is widget enabled and compatible with WordPress 2 and above.
Simple Power is a two column theme with a dark background and header. The content section is consists of a single sidebar to the right side. The theme is widget ready.