Maryland Libraries Sandbox is a great way to get comfortable with wikis. I enjoyed looking through the variety of pages people created. My favorite was "Best Breakfast in NYC," probably one of the smallest. What a great way to find out about the B&H Dairy on 7th Street and 2nd Avenue.
I added a book review to the "What I am Reading" page, and then added my own blog to the Baltimore County Public Library list on the "Favorite Blogs" page. I was nervous doing this, but it worked out. When I added the book review, the page editor even recognized it as a Word document and offered to 'clean it up' for me. I didn't know what that meant, but I said yes and it gave me a great looking paragraph.
You really can alter these wiki pages after signing in, and at first that can be intimidating. Sometimes it seemed too easy just to place your cursor somewhere and start typing. But after a while, it became second nature. Anyway, check out my book review on "Murdering Mr. Lincoln" (what else?) and I hope you enjoy the Maryland Libraries Sandbox as much as I did.