I get a considerable percentage of goto traffic from the earthlink ISP portal. It appears to be pure goto results, including non-paid ink listings.
Mamma (meta search) also sends some referrals. They blend the results from other engines, ixquick style. They do list goto listings that are above # 10 on goto, mixing with listings from other SEs. It was interesting to find a lower goto bid listed better on the SERP than a higher bid. The lower bid also had other add'l SE listings. It is also interesting to note that some listings are found at goto and findwhat, but it appears they only register the click to goto. (probably higher commission)
Ixquick rarely sends a referral, but is structured like mamma. For a #2 goto listing, I am #10 on mamma, but #20 on ixquick. Mamma may meta search fewer SEs, with a focus on PPC. (I can't find concrete info on their site, just looking at the SERP info.)
Metacrawler is another meta SE with similar style results to mamma, ixquick. Added: metacrawler made their site my homepage without asking!! That can really tick people off.
Compuserve search websearch.cs.com also does well for me, close to aol numbers at times. They list all goto bids first under "Premium Web Pages." When they run out of goto (bidded) listings, they switch to "Web Directory Sites," which come from their (ODP) directory.
Getting some from searchfuel, but they are timing out for me right now. Will try to update later with their incorporation of goto listings. (maybe pure?)
C/net's search.com lists the first 5 goto bidded listings at the top, calling them "Search Partners" listings.