two more "issues"
1.
It breaks this link:
http://www.amazon.com/review/product...owViewpoints=1
since it has an ABIN number but is not meant to go to the product itself
2.
It doesn't handle [url=http://www.link.com]text[/url] (without quotes)
Regarding #1, in a related note, I might even prefer the urls all to be redirect urls via Amazon rather than any in the more abbreviated ABIN version... since that way the final url is as intended by the origanal poster, and your referal code is no longer embedded in the final destination url. But that might be a personal preference.
thanks
arn