The standard D&D character sheets, while usable, are always capable of being improved. For 4E I got a particular itch to create anew because the editors seem to assume the use of index cards to keep track of powers (or at least some method separate from the character sheet), and I didn’t see why it couldn’t be done on the character sheet, along with everything else, on the standard front-and-back one page–which none of the many custom character sheets I’ve examined do, either, despite other (often major) improvements on the official sheet.
Several days later, I see why. While it is possible to use just a character sheet without power cards, you have to be prepared to use a lot of shorthand and rely on the power sections as reminders rather than actual recordings of the rules. (For example, for my sample warlock I statted up I have this as the effect of one power: “For encounter, allies in 5: 1 + int to atk against same enemy; miss: allies in 5: +1 to atk ” ” “. )
If you take the power sections out, however, there not that much information to actually record; I ended up with the entire bottom half of the back page empty.
In any case, I’ve been staring at these too long to accurately ascertain their utility, but there they are nonetheless.
D&D 4E Character Sheet (w/o Powers) (PDF, 60 KB)
D&D 4E Custom Character Sheet (w/ Powers) (PDF, 65 KB)