Doug Rathbone, a Web Applications Consultant, has published an article on his blog recently outlining a bug he has come across when developing on the Windows Phone 7 platform with regards to the 260 character limit for toast (push) notifications for live tiles, which can reportedly be a pain when pulling a tile from an SSL path that contains security keys and other parameters.
He has gone into depth about the problem and attached a sample app that one can use to reproduce the bug and "experience all the fun". Of course, if this was an issue with long paths in URLS, URL shorteners such as bit.ly could be extremely effective. A very good read nonetheless.
Source: Doug Rathbone