Definitely the easy ones first to get them out of the way, like changing the 'Submit a Story' text, investigate the numbered list wrapping around to 0 after 9, etc. The resteemed posts showing up on my blog and other blogs are confusing as there is no clear indication they're not the author's except for the small author name, so a new tab would be ideal. I plan to clone the Steemit site to a public sandbox, say as a subdomain on http://bitcoiner.me and can let users play around with changes I make locally and get feedback. After all is good, I'll then submit the pull request.