If you are running a blog you may want to investigate Technorati tags. You can read about them here:http://www.technorati.com/help/tags.html The reason I mention it is that these tags are being indexed by Google and showing up on the first couple of pages of the SERPs. Not huge traffic but every little bit helps.
Plus, these tags are utilized by almost every index and search engine. I started using them a couple of weeks ago on my site, and haven't seen an increase in traffic, but every little bit does help, as you said.
I would think a good tip would be linking to multiple blogs you've started from within your own blog.
Depends on the topic. If you have a webmastering blog, then a CSS blog, and/or design blog, and/or money-making blog, then sure. But if you've got Jimmy Jim's Blog about his life and about his ex-wife's cat he stole, then it may not be quite as good of an idea.