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Lycos (UK) runs their programme through TradeDoubler. AskJeeves (UK) has a similar programme, apply on their site.
You'd probably have to find other options if you have US traffic to sell...
Overture is no longer accepting new applications for the Search-in-a-BoxTM program. Current Search-in-a-Box affiliates may review existing Terms and Conditions.
Try search123 ppc affiliate program or ah-ha. They don't perform as well as overture but are better than nothing.