check out my new routine

Day 1: chest and back
- flat barbell bench 3x
- incline dumbell 3x
- cable crossover 3x
- lateral pulldown 3x
- bent over barbell rows 3x
- cable rows 3x
 
Day 2: rest
 
Day 3: arms and shoulders (front and side only)
- tri-set of seated barbell press - front rise - side lateral rise  2x
- barbell curl 3x
- triceps dips 3x
- dumbell curl 3x
- triceps pushdown 3x
- concentration curl 3x
- rope pushdown 3x
 
Day 4: rest
 
Day 5: legs and abs
- squat 4x
- deadlift 4x
- lunge 3x
- leg curl 3x
- leg extension 2x
 
Critique please!

5'8.1"
Age = 20 
started in February 16th 2007: 58kg (127.6lbs)
current : around 79-80kg (173.8lb-176lb)

out of curiousity, what was your last routine?
 
i might consider re-arranging your split and getting deadlifts away from after squats, put them on back day and give that its own day rather than combine with chest. when you combine chest and back, youre putting 2 large muscle groups together then with arms and shoulders, its two smaller groups...why not something like this:
chest/shoulders/tris
back/bis (with deadlifts first on this day)
legs/abs
 
or a 4 day with:
chest/tris
back/bis
legs
shoulders/core
 
also, imo pullups are better than pulldowns. if youre going b/o rows, i doubt cable rows are needed, same with crossovers (maybe put dips there)...for shoulders focus on the oh press over isolations esp front raise, id do 3 sets oh press, maybe 2 lateral or something if you wanted.
 
im not sure if you need all that for arms, id keep barbell curls and a tricep exercise, but your arms will get hit well from heavy rows and benches.
 
leg day loks good once you move deadlifts to back, what you could do is add sldl in place of leg curls to take care of the hamstrings...leg extensions may not be needed either, maybe alternate in leg press or something too
 
how long have you been training? are you bulking?
 
if you havent tried a full body routine, id recommend giving that a shot at some point. im just on my second week and have gained 2.5 lbs, which since ive had trouble gaining weight, is awesome.

bulking/strength training

soon to begin bill starr's 5X5

current maxes: 
squats: 255
deadlifts: 300
bench: 185
oh press: 125
goals for jan 1:
squats: 300
deadlifts: 350
bench: 210
oh pressL 145 

First of all, thanks for the reply...!
 
Umm.. before I started this routine, my regime was a HST routine which probably looked like what you are doing right now.
 
I really love the whole regime, but then I got bored and decided to switch up to something new.
 
I did HST for 6 weeks, then take a rest for 1 week, and just started this new routine.
 
Even before I did HST, my splits looked like the ones you posted here. A friend of mine in the gym (who is pretty big) said to me that he is currently doing this routine in which he combines chest and back as well. He said he switched things up because he stucked in a point whereby his physique did not react to the split.
 
To be honest, I don't know man... I just thought I wanted to try this new routine and hope for the best.
 
I might do a couple changes to the exercises though, like what you said.
 
I've been lifting for a couple of years, but I seriously watched my diet and my training since Februrary 2006. And yeah, I am trying to bulk as much as I can.

5'8.1"
Age = 20 
started in February 16th 2007: 58kg (127.6lbs)
current : around 79-80kg (173.8lb-176lb)

My opinion:
1: change the order so that arm and shoulder day is day one.  I would use this as a way to pre-tire the assistant muscles before you hit chest a back.  kind of like a pre-exhaust routine, but done a day apart.
2: I would drop 1 exercise per bodypart as you are doing too much at a time and will not have good intensity left over for the other exercises, and therefor are going to be wasting your time.