I have been thinking about ways to generate a bit more discussion here, so I am going to try and start some more concept related threads. The thing that I am interested in is what you guys think of the double bet on 4th when you pair your door card and do not have trips.

As a rule, I always double bet, but this, particularly heads up, gets me into trouble. For example:

PokerStars Game #12139998438: 7 Card Stud Limit ($2/$4) - 2007/09/18 - 23:34:13 (ET)
Table 'Kriemhild V' 8-max
Seat 1: J0KEL ($29.25 in chips)
Seat 2: Trendkill03 ($56 in chips)
Seat 3: Juskimo ($111.25 in chips)
Seat 4: adams 262 ($123.50 in chips)
Seat 5: DarkRommel ($78.75 in chips)
Seat 6: mark98 ($59 in chips)
Seat 7: benbendan07 ($70 in chips)
J0KEL: posts the ante $0.25
Trendkill03: posts the ante $0.25
Juskimo: posts the ante $0.25
adams 262: posts the ante $0.25
DarkRommel: posts the ante $0.25
mark98: posts the ante $0.25
benbendan07: posts the ante $0.25
*** 3rd STREET ***
Dealt to J0KEL
Dealt to Trendkill03
Dealt to Juskimo [2h Jh 3c]
Dealt to adams 262
Dealt to DarkRommel
Dealt to mark98
Dealt to benbendan07
Juskimo: brings in for $1
adams 262: folds
DarkRommel: calls $1
mark98: folds
benbendan07: folds
J0KEL: folds
Trendkill03: folds
*** 4th STREET ***
Dealt to Juskimo [2h Jh 3c]
Dealt to DarkRommel
Pair on board - a double bet is allowed
Juskimo: bets $4
DarkRommel: calls $4
*** 5th STREET ***
Dealt to Juskimo [2h Jh 3c 3s]
Dealt to DarkRommel [9h 7h]
DarkRommel: bets $4
Juskimo: calls $4
*** 6th STREET ***
Dealt to Juskimo [2h Jh 3c 3s Qh]
Dealt to DarkRommel [9h 7h 7s]
DarkRommel: checks
Juskimo: bets $4
DarkRommel: calls $4
*** RIVER ***
Dealt to Juskimo [2h Jh 3c 3s Qh 5d]
DarkRommel: checks
Juskimo: bets $4
DarkRommel: calls $4
*** SHOW DOWN ***
Juskimo: shows [2h Jh 3c 3s Qh 5d 8h] (a pair of Threes)
DarkRommel: shows [Th Ts 9h 7h 7s 4d 3d] (two pair, Tens and Sevens)
DarkRommel collected $34.75 from pot
*** SUMMARY ***
Total pot $35.75 | Rake $1
Seat 1: J0KEL folded on the 3rd Street (didn't bet)
Seat 2: Trendkill03 folded on the 3rd Street (didn't bet)
Seat 3: Juskimo showed [2h Jh 3c 3s Qh 5d 8h] and lost with a pair of Threes
Seat 4: adams 262 folded on the 3rd Street (didn't bet)
Seat 5: DarkRommel showed [Th Ts 9h 7h 7s 4d 3d] and won ($34.75) with two pair, Tens and Sevens
Seat 6: mark98 folded on the 3rd Street (didn't bet)
Seat 7: benbendan07 folded on the 3rd Street (didn't bet)

So I guess the question is, do you always double and how far do you take it unimproved?

I'll always double-bet if I'm interested in playing the hand -- goes to my 7CS philosophy that you need to play a good hand as fast as possible on the early streets.

But this isn't a hand I'd be interested in playing, so I would have no problem check-folding.

I suppose it's not horrible to double-bet it here to see if you can steal. But I certainly would have given it up on fifth. If you're feeling really frisky, you could continue the steal attempt with a fifth-street raise. But what is the point of calling fifth?