Those are both great answers! (Jackie did you start blogging??

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A well-written release and a regularly updated blog *on* your website can be great for getting found in the search engines as well.
When there are more relevant links to your professional website or blog your site naturally moves up as more relevant in the searches for the particular keywords you've linked up in your press release or blog.
Also, blogs are a great way to keep site visitors *coming back* to your professional website, especially if you're well informed or stay on top of a particular industry, for instance, if you specialize as a VA real estate...if you write regular, informative posts about the real estate industry, then people who are interested in the industry will be more likely to come back to you for news, not to mention all the content you're authoring that will be indexed by search engines.
A blog is also a great way to generate unique interest in your skills as a VA. Anyone can get a website up there - but when you have a blog it gives potential clients more insight into your aptitude for communication in general.
Actually *any* content that's profesionally done and is attached to your company name (as a keyword rick text link) will enhance your professional site in the same way - social networking profiles, videos, other types of publications, forum posts