From the "Doe!!" palm-slap to forehead department:
You want to sing something in the key of B (who does that, except crazy people?) and play it on the ukulele too? Then you look at the chords and think "Satan invented those."
Your first thought is "play it in A and capo it up two frets, right?" Ah, but you would be thinking like a guitar player (Todd, Laurie I'm talkin' to you!). The key of A (for jazzier stuff) is another horrendous key on the uke. C, F and G are your "friendly" keys!
Then (thank you Dan my teacher) you figure it out....tune the damn ukulele down a damn half-step. This is where my music theory failed me (I had help, thank you, Dan!). So for the first time, I tuned the uke to a different tuning. Instead of G. C. E. A it became Gb, B, Eb, Ab. I needed the keyboard for that. (Boris, you can stop laughing now, OK?)
And, voila! "Smile" in Madeleine Peyroux's key. I shall practice it and play it for you all.