The above link will take you directly to the main page, where you'll find almost all of your beloved newspaper comics online!
Such as:
Alley Oop
Andy Capp
B.C.
The Born Loser
Dilbert
Li'l Abner Classics
Nancy
Off The Mark
Opus
Wizard of Id
And more!

Go Comics has even more favorites!
Such as:
Bloom County
Calvin & Hobbes
Doonesbury
For Better or for Worse
Garfield
Ziggy
And more!