LiveScience.com has an interesting article on how blogs and websites can give your career a boost. Intrigued, I did a quick search and immediately found Cindy Eng's web portfolio. More a virtual resume than anything, it's simple and yet quite informative about her career in publishing (the daisies instantly reminded me of Lori Devoti, who has made the daisy her trademark.)
I don't think weblogs are static enough to be portfolios, and if you crowd too much bulk data or big graphics onto your blog it can become confusing (especially for those of us who have the attention span of a three-year-old.) Most authors have one-click links on our weblog sidebars that take you to our web sites, which is the easiest and most unobtrusive form of marketing via blog. If you want to know more, you click, if you don't, no problem. Links to online bookseller ordering pages for current releases are also popular, as is using cover art as click-through icons for these.
Monica Jackson and Donna Hill are presently collaborating on Donna's new Wordpress website, which like Monica's own website is eye-catching and yet simple and easy to use.
Alison Kent's weblog has click-throughs that will lead you to comprehensive info on her books, her bio, latest content, message boards, the works -- all via six modest little links on the sidebar.
Personally I covet the subtle linkage over at Holly Lisle's writing diary -- it's all over the place on her page, and yet she's integrated it so well that it doesn't get in your face.
I'm not practicing what I'm preaching, of course, but you've never seen what I can do to poor, unsuspecting HTML. It isn't pretty.
Do-it-yourselfers, for more ideas, specific techniques and even the codes to customize and refine your blog linkage, try my absolute favorite in free weblog design resource sites, Mandarin Design.