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I don't even see ads except on the weekly tips section.
As a rule of thumb, wider ad sizes tend to outperform their taller counterparts, due to their reader-friendly format. Readers absorb information in "thought units," several words at a time. Wider sizes let them comfortably read more text at a glance without having to skip a line and return to the left margin every few words, as they'd have to with a narrower ad.
If positioned well, wide ad sizes can increase your earnings significantly. The sizes we've found to be the most effective are the 336x280 Large Rectangle, the 300x250 Medium Rectangle, the 728x90 Leaderboard, and the 160x600 Wide Skyscraper.
Anyone else use the large rectangles?Not 336x280 but I do use 728x90 leaderboard and they suck. Probably because I stick them into the space where everyone expects to have a banner ads and ad blindness kills it.
so I can see where he might want to make them look bigger with large font