The URL auto parser (the one that takes URLs and automatically puts them inside a [.url][/.url] pair) does not behave correctly with parenthesis.
Example: enter the following in a post:
Code:
See this link (http://www.united.com/page/article/0,6722,51366,00.html)
and you will see the generated [.url][/.url] pair will have the right parenthesis
inside the tag, i.e.
See this link ([.url]http://www.united.com/page/article/0,6722,51366,00.html)[/.url]
(Note: I use .url in this post to prevent the parser from actually interpreting the url tags).