I have just discovered this CSS Gallery submission service offered by a company called The CSS Gallery List: http://www.thecssgallerylist.com/ For $20 bucks they submit you to 87 high pagerank, do follow CSS galleries. I just tested it out on one of my customers sites and they got amazing results. For more information including details of which CSS galleries have sent the most traffic visit my blog post here: http://www.seoco.co.uk/blog/2009/06/01/the-best-20-i-have-ever-spent-on-link-building/ I 100% recommend this service to anyone with a decent looking CSS site.
You can submit to them yourself for free if you can't afford the service, all of the galleries are listed on the site in order of PageRank.