Not sure if anybody had been paying attention but valve has another ARG(Alternate reality game) on the go, which going of their comments back in November, should breach the gap between portal 1 and 2. People might remember the last ARG they did back in March last year which eventually gave out a whole lot of screenshots and was the first confirmation of a portal 2 sequel.
It all stated on the first of April when Steam released the "Potato Sack" Collection for PotatoFoolsDay. However in all the 13 games on the collection they released a small patch which changed some small files and added small new maps etc. Much like they did back last year when they added radios that played morse code and SSTV images. People haven't got very far deciphering everything yet so there's plenty of chances to help them out, or simply do what i do and sit back and watch the progress. Jump onto the Portal2 forum
on steam and follow the threads for the fun, or simply keep track of the up to date wiki
for the ongoing results.
Also The portal 2 release date was upped today on steam, unlocks on April 19th