I realise this is a Google related discussion, however Yahoo! trims the last / from any listing in it's SERPs.
I found it highly irritating and as such I have to ensure both combinations work or Yahoo! and MSN SERPs suffer...
Unless I am mistaken you will not find a single / as the last character of any link from Yahoo! or MSN SERPs.
[edited by: petehall at 12:49 am (utc) on Nov. 26, 2004]