I learned a lot about Eclipse from the tutorials from http://www.vogella.de. Lars Vogel has introductory tutorials for almost every Eclipse topic. These are very helpful for getting started.
He also blog about Eclipse under his blog http://www.vogella.de/blog and speaks about Eclipse on conferences.
He also has a lot of programming tutorial about Android with Eclipse on his website.
Every time I check for something on http://eclipse.org/resources/ it seems that every second tutorial is written by Lars.