Yahoo does seem the most responsive in terms of e-mail support. I have contacted Google, Yahoo and MSN on different issues recently, and Yahoo was always helpful and actual communicated in a manner that indicated someone read it. I would put Google a very far second just because their form letters are not as cold as Microsofts.
I bet they'll get a ton of e-mails to that address now.. I sent a mail to them a couple of days ago, and I got an answer today. It was pretty much the same as the ones already listed in this thread (about scraper sites), but they had even included a little smiley face in there.. Hi, Thanks for the review request! Engineers will have a look. No worries on the scrapers. We know all about scrapers and we never hold links from scrapers against you :) Search Engine Spam Reporting Yahoo! Corp. Code (markup): Now I'll just have to wait and see if my site gets indexed properly again.. A site:www.etc search on Yahoo returns over 6,000 indexed pages for my site, but only the index page is cached and has a description.. The rest of the pages only includes the page title (some of the titles are actually from Dmoz? and not the title on the real page) and the link, but no cached content.
Thought I would post this for future reference. This is an excerpt from an email I received from Yahoo.
I emailed them yesterday about about a site of mine. It's in the index but lost every ranking. They show about 1400 pages and many of them are thing like mydomain.com/Big_Breats.htm (it's been this way since the last Major update... 2 months ago?)... all of the titles are shown in lower case as well. Today they suddenly reduced the number of indexed pages to around 1100, most of the URL's that never existed are gone (but not all) and most of the titles being shown are the full URL... not the actaul title. Do you think some one is actually trying to fix the screw up with my site that quick?
I think all your site titles in yahoo being lowercase is a good sign you are banned in yahoo. They will almost always show your pages, because they love to tout how big the index is, but they won't be in actual SERPs. I sent a reinclusion request, but nothing as to results in the SERPs yet, though an engineer did get back to me to say he'd forward it on.
#1 in the directory when sorted by popularity YET banned from the index. Whacky I say, just plain whacky...
The exact opposite thing has happened to my site now (three days after I received the reply from them).. Jumped from 6,100 indexed pages (without cache), to 17,500 pages (still no cache)... And the page titles they show are not the ones I have on my pages (never been that either), and a few of them actually seems to be the page title used in my Dmoz listings..