Heroes Spoilers!

Here:

http://spoilertv-heroes.blogspot.com/2009/02/episode-3x17-what-to-expect-and-beyond.html

and here:

http://spoilertv-heroes.blogspot.com/2009/02/full-summary-of-behind-eclipse-14.html

The WORKING title for Episode 3x23 has been confirmed as "1961".

Source: The ODI