Hopefully 4e will bring back the ability to effectively multiclass. In 3e even taking a single level in another class decreases the effectiveness of most characters (especially rogues and spellcasters). Rarely in my campaigns does anyone ever multiclass anymore. What's worse is that % penalty they should receive for not keeping class levels close to equal, if anything, since multiclass characters are weaker from the get-go, it should be a % bonus! I miss the olden days when a fighter/wizard/thief type character could actually be fun to play and not just the party pissboy.