Just tried to do the latest upgrade for Add-to-any on a WP 2.7.1 install, using Firefox and the upgrade failed with the following install path showing in the result -
.../public_html/blog/wp-content/upgrade/add-to-any/add-to-any/share_save_120_16.png
There should only be one /add-to-any/ in the path
Looks like a typo in the XML by the plugin author (it happens to us all) so though I'd best shout it out to give them a chance to fix it.
Regards
Gaz