Interesting timing, as my 5-year wedding anniversary is this week
You can find suggestions on google; this site lists all of the years with suggestions for each:
http://www.unique-gift-inspirations....s-by-year.html
We never followed the "list" so we won't follow the wood/silver theme for this year; I knew a guy who bought his wife a new car for the first anniversary (and partially screwed himself in the process because he'll never be able to top that!)