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Hi on this lesson:
http://moz.com/academy/elements-of-links, you can also give a link a title attribute. In my humble opinion that was missed in that lesson but is important for usability and SEO.

Hi I noticed a dip in traffic after my last relaunch as well but it got back to normal within 2 weeks. I can recommend doing a search in google with site:yoursite.tld to check which sites are listed. Make a Excel Sheet from that and check if you have done all the 301 properly.