I am so glad you used those tips and obviously have great results from it. It is all about creativity, I guess. If you think of a new and fresh way of generating traffic, that not too many bloggers are using already, you are on a roll. And Flickr was one of those that were not over saturated with bloggers searching for traffic. Thanks for the feedback and can't see the results with new strategies :)
One of the things that makes social media a bit more attractive than search engine optimization is that you get to maintain a bit more control over your success. You can always find new ways of improving your strategy and you can learn from your mistakes and your wins so that you can improve your traffic in the future. The same can't really be said about SEO - although it's very clear what not to do, it's not always as clear exactly what strategies can help you improve your ranking.
I had great results with Stumble Upon cause I have been a user for years and Stumble a lot of things that have nothing to do with blogging or my blog. And Networked blogs is working great for me too :) I am glad you found some new sources here. I would love, if you had the time, to look into one or two that seam interesting to you, and maybe try them out... and then come back and tell me if they worked OK for you?