I would also like to add -- when searching at ancestry.com
Use the OLD search page: http://www.ancestry.com/search/default.aspx
and also use Exact searches but with wildcards: ? for one letter, * for several letters.
For example, today I was looking for a Sybilla Winams, so I tried an exact search for Syb* Win*
I found her first name as Sybilla, Sybil, Sybel, and Sybelle (and they were all her!) and I found her last name was actually Winans, using this method.