It looks like SERP Titles are re-written, Does anyone know details regarding the same? Did you notice this? I think many of them should have noticed this already. The Google's SERP title for very popular websites are different from the page title. I am not sure if there are editors doing these manually! For the query "forums.digitalpoint.com" we got the following figure below But the actual Title is different
I think that the forum is indexed with this title before and its not updated or maybe it's true that the titles are re-writen.
Sometimes Google (and other search engines) uses Dmoz Titles. Example: http://www.dmoz.org/Computers/Internet/Web_Design_and_Development/Promotion/Chats_and_Forums/ To stop this you need to put: <META NAME="ROBOTS" CONTENT="NOODP"> in you meta tags.