S.G.
Hey A.,
I have an almost 5 month old and I'm still sleep training her, she's sleeping through the night though, sleeps about 10 hours straight! However, she still has a difficult time getting to bed (especially for her naps). I'm with you on how it's so hard to "Ferberize" her (more h*** o* me than on her I'm sure) so I read somewhere that you can do the "parent friendly" Ferber method...just go in every 5 minutes, instead of every minute, or instead of what you're doing with letting her cry it out. 5 minutes seems to be a happy medium, and in my experience, my daughter's worst time took her 45 minutes to finally give up and go to sleep.
Also, I don't want to say anything really bad about co-sleeping, but I have known people who have co-slept with their kids until "they're ready" and I have never heard of it being an easy transition. Once they're in your bed for that long...I think it's REALLY hard to get them out! I co-slept my baby when she was an infant, but once she was about 6 weeks old, she was in her room...and in her room she shall stay! I think co-sleeping past a few months old is just asking for trouble, both with your baby AND with your husband!
Good luck! I know it's hard, but it'll all come to an end one day!!!
S.