Looks interesting, how does blekko index search results? I prefer how millionshort lets you disable/enable specific sites for search. Although, given how millionshort is designed specifically for removing results, it would be more difficult to do that on blekko.
When you get results back on blekko, if you are logged in there is an option in the drop down next to the results to say 'spam'. If you select it then the site will be added to your personal spam list and won't show up in your results.
Another technique is to create a slash tag, then add results you get to it from sites you sometimes want to exclude (so for example if you are looking for Hackernews article references but don't want to include hackernews urls in the result) then you can do the search with -/yourtag and it will keep the sites that are in 'yourtag' out of your results for that query.
Can be a very powerful tool for dealing with information white-out where some high ranking site has a lot of hits.
Blekko has given me great results before, and I've found gems I haven't found elsewhere, but I'm not 100 percent ninja with the slash syntax yet, which is maybe a reason why I still use Google most of the time.
I'll bookmark this handy page and try to get in the habit of using it regularly.
