WizarDru said:
If I were you, I'd read Piratecats', Sepulchrave's and my story hours. I would then go to the Rogue's Gallery forum here on ENWorld, and look for the associated discussions. PC and mine have many NPCs and items that are of Epic Level, and Sep's also has Epic Level Spells (that are used in his story hour). You can find links in my .sig.
I second this; in fact, I cannot recommend this course of action emphatically enough. Rules, supplements, books, articles, and mechanics aside, these story hours capture Epic level in a way that is outstanding, and (in my humble opinion) in the case of Sepulchrave II's story hour, astonishing. His may be some of the finest fantasy adventure writing I've ever read.
The mechanics are good, and can usually be found in the related Rogue's Gallery threads, or house rules threads attendant with each story hour. But for the feel and flavor, check out those three (at least, there are more) story hours. They are chock full of well-realized characters, interesting writing, challenging situations, intricate stories, fantastic plotlines, good humor, and good old-fashioned storytelling, and all deal with high level play in a way that is believable within the scope of D&D. I know I always thought that 20+ level characters could pretty much surmount any challenge. Then I read Sepulchrave II's story hour, and now I know better (still can't do it myself, but I know better
)
Get comfortable, though, because they're not short. But they are worth a look.
Warrior Poet