Good places for information
There is no website that you can use all the time for chess: I gaurantee you that. Every single website or blog does not cover every aspect of the game, and mine is a prime example of that. So I would like to list some good books that I have found really useful.
For starters
If you are just starting to research chess seriously, then here are two good sources of information:
1. The Ultamite Book of Chess Strategy by Jeremy Silman. This book is very instructive. It gives wonderful explanations of basic chess principles.
2. www.chess.com This website is a wonderful place to get started. With everything from openings to playing online to its hundreds of instructive chess videos, I highly recommend it! It is absolutely free to become a member. If you are really serious about playing online, ICC (Internet Chess Club) is probably the better place, although it costs money. My name is Traxlerman on chess.com. Hope to see you online!
3. Chess Tactics for Champions by Susan Polgar and Paul Truong. This book contains hundreds of puzzles that will sharpen your tactics as fast as a good pencil sharpener sharpens a pencil. It did for me!
4. Judgement and Planning in Chess by Max Euwe. This book shows how to take asvantage of teeny weaknesses in your opponents play such as backwards pawns and queenside pawn advantages. This book is awesome!
I hope you get all of these, as they are all really good. If you have any other sources that you recommend, please comment! I may not like closed positions, but I am very open minded. 
