I just upgraded to WordPress 2.1 (improvements to the editor on the “Write Post” page alone are worth the time spent on the upgrade) and have run into an issue with get_links(). The first argument to get_links is the category id. If you don’t specify an argument or pass in -1, all links are returned.
I manage the Tutorials, Friends, and Blogroll sections of my sidebar using get_links() to return link info. After upgrading, this stopped working. If I pass in -1, all links are returned, so the functionality isn’t totally broken. But, specify the integer value for the category id no longer seems to work.