Since I was sick to subscribe both connotea and citeulike to follow the feed of papers I’m interested in, I decide to create a Yahoo!Pipe to merge those two sources.
It’s easy. Just insert a tag and get the results from both sources. Duplicated results (paper with same title) are automatically deleted by the pipe. Once you have the results you can decide to subscribe to the feed by clicking the RSS icon.
Feel free to use and comment. If you have any idea for improvements just clone the pipe and modify it.