My completely unscientific election predictions:
President: Obama 294-244 (Obama wins Ohio and Virginia; Romney wins Colorado and Florida)
Popular vote: 51-49 (two-party vote)
Senate: Republicans +1 Gain Nebraska, North Dakota and Montana; Lose Maine and Massachusetts
House: No net change. 242-193.
I actually went through and assigned each seat based on my predictions and came out with exactly the same numbers as last election. This result is pretty unlikely given that there are new seats, lost seats and redistricted seats due to the new census. I have 10 seats switching from R to D, 7 switching from D to R and both member-on-member fights going to the GOP. These numbers don't necessarily add up because of reapportionment and redistricting new seats.
I tend to be skeptical of big gains from redistricting since there seems to be some backlash by voters to it. However, I do see multiple seat gains for the Republicans in North Carolina and for the Democrats in Illinois because many Representatives in those states won by close margins last time as it was.
Edit: Right after I posted this, I decided to flip-flop Colorado to Romney.