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I am actually pretty decently ranked on Interviewstreet because I do have a personal interest in algorithmic stuff (I was top in Australia for a little while :)). I used to do your codesprints just for fun.

My feedback to you would be that Interviewstreet is heavily heavily geared towards academic algorithmic questions which the average developer would not have a chance in hell of solving. For example, in order to solve some of your old Hacker Rank questions within the time and memory constraints you pretty much have to know the studied and documented solution you would only ever be exposed to in doing a masters degree in CS. Heck, your problem descriptions were often thin veneers around the exact academic statement of the problem.

Despite the fact that I'm someone who actually does excel at these types of problems, I think they are absolutely the wrong way to hire people and whenever I've seen companies actually use Interviewstreet it makes me cringe - and yes I know companies set their own questions, but you lead by example and so most questions are abysmal.