A rash of new discoveries in the last month or so have netted a compound capable of having  superconducting properties well above the boiling point of of nitrogen.  It’s superconducting properties are kept until 138K, add pressure and this can be raised to a whopping 164k.  That’s half-way to 298K room temperature.   

http://arstechnica.com/news.ars/post/20080420-superconductor-breakthroughs-abound-some-like-it-hot.html