These are the links I use regularly to keep up with the news.
Rift Dimension Gallery – Pictures of dimensions and their locations. A great way to see dimensions without visiting.
The Dimension Touring Company – Feendish and DimensionDiva go touring, bringing the best of dimensions to public attention.
Rift Dimension Addicts – a dimension item database with a great search engine and easy to use drop down menus.
Rift Community Forums – get the news at the source.
Rift Scene – news, guides, opinions, this blog has it all. Retired April 2016.
Riftgrate – news, gaming guides, walkthroughs and livestream summaries. Retired March 2016.