Hi Heidi,
We came across a hand that we didn't know how to bid today:
EW Vulnerable, N is dealer:  
  
     | 
    North♠QT82♥4♦K976 ♣Q764 | 
     |   
  
  
    West♠A7 ♥Q7♦A53 ♣AKT985 | 
     | 
    East♠95 ♥KT85♦QJ42 ♣J32 | 
  
  
     | 
    South♠KJ643♥AJ9632♦T8 ♣ | 
     |   
  
  
    | N | 
    E | 
    S | 
    W | 
  
  
    | Pass | 
    Pass | 
    2♥ | 
    3♣ | 
  
  
    | Pass | 
    Pass | 
    ??? | 
     | 
  
Question: Should South have bid 3♠?
Heidi's Answer
"6-5 Come ALIVE!  Bid until you are Doubled, Game or Slam!" was one on my mom's favourite sayings.  This hand certainly qualifies!
I would say the South hand is just TOO good to open a weak 2 with that distribution.  They should either open at the 1 level (which is fine since they are in third seat) or potentially "Pass" and come in later.  Since they are in 3rd seat I would open the bidding for sure.  (If Partner wasn't a passed hand I still might open at the 1 level but I also might "Pass" and hope to show a distributional hand with majors later on.  Depends on my mood.  Certainly the colours are right for bidding.)
But in third seat open at the 1 level.  You are allowed to (even encouraged to!) open weaker hands in third seat.
But what to open?
If you open 1
♥ you risk not being able to show your ♠ suit.  If Partner bids 1NT, bidding 2♠ is a reverse showing a strong distributional hand.
Another option is to open 1♠ and rebid 2
♥ showing a 5-4 or 5-5 hand depending on the auction.  But this will never get across to Partner you have longer 
♥.
Unfortunately you have to make a choice.  But fortunately I think either bid works here.
If South opens 1
♥, West will probably bid 2♣.  Now North can Double to show ♠ and 
♦ (Negative Double).  East will bid 3♣ but South can now bid either 3♠ (minimum) or 4♠ (if they realize the potential of their 6-5.)  After a 3♠ bid by South the Opponents might compete with 4♣ -- West is very strong -- but that just might push N/S into their 4♠ game.  
If South opens 1♠, West will probably bid 2♣.  Now North will show some sort of ♠ raise.  Either a limit raise (with a 3♣ bid) or a simple raise with a 2♠ bid.  After a limit raise South should bid game on their distribution alone.  After a simple raise of 2♠, East will bid 3♣ and South can make a game try with 3
♥.  West might bid 4♣ but even if they don't, North should bid 4♠ since they can help stop the 
♥ losers with their singleton and extra trump.
If West bids to 5♣ North should certainly DOUBLE them.  PENALTY.
South might have some stressful moments with the Double (after all they don't have many points and/or tricks with all their bidding) but should trust their partner and sit for it.  Partner should only count on them for having a distributional hand with the majors which is exactly what they have.
If South leads a ♠ the Defence will certainly take this contract down three for 800 points.  Even a lead of their singleton 
♥ should take the contract down two for 500.  Either one makes up for the NS game (420).
Suggested Auction
I think South should just open 1♠ in third set.  You plan on telling Partner you have the majors and let them choose which one to play in.  I'd hate to give up on the ♠ suit by opening 1
♥.
North will probably just give a simple raise to 2♠.
South can now show their 
♥ suit looking for a potential game.  6-5 Come Alive!
North should bid the game with their singleton 
♥ and extra trump.
West will probably be in there since they do have quite a strong hand.  Sometimes points do not equal tricks unfortunately!  I assume they will try to defeat the Opponents rather than bidding 5♣.  If they do decide to bid 5♣ North should DOUBLE and West will be sorry.
  
     | 
    North♠QT82♥4♦K976 ♣Q764 | 
     |   
  
  
    West♠A7 ♥Q7♦A53 ♣AKT985 | 
     | 
    East♠95 ♥KT85♦QJ42 ♣J32 | 
  
  
     | 
    South♠KJ643♥AJ9632♦T8 ♣ | 
     |   
  
  
    | N | 
    E | 
    S | 
    W | 
  
  
    | Pass | 
    Pass | 
    1♠ | 
    2♣ | 
  
  
    | 2♠ | 
    3♣ | 
    3♥ | 
    4♣ | 
  
    
    | 4♠ | 
    Pass | 
    Pass | 
    Pass |