If I was to have any issue with the dictionary links at all it is that on my system when I click on an underlined word it redirects my current web page to the linked info, it would be easier if it launched a pop-up window.
I'm using Firefox v3.0.7 with a completely 'out of the box' set-up if Mike reads this and finds it interesting. But I tested with IE7 as well and got the same result.
But as MissMTS said its still a good idea so you know that if you type
nitrogen cycle etc when responding to a post you do not have to remember to include a link to the Cycle page as well.