I am not currently weaning, but I did push DS to wean this last spring and thought I'd share my experience.
I had always figured we'd nurse until 2ish, but he had no interest in quitting so I just went with it. He was still in our bed and knew how to help himself to the boob, so he was nursing several tiems a night (I didn't realize how much until we did wean and all of a sudden he started eating these huge breakfasts!) Honestly this next time around I plan to start moving baby into the crib (but still in my room) by around a year, and hopefully nightweaning around the same time. I love co-sleeping for the convenience of it, but as the kiddo gets to be a toddler the bedsharing is hard on my relationship with DH, so I want to start the transitions earlier next time...
Anyway, I got pg when DS was 25m, and I figured to nurse through the pregnancy and then tandem--I thought it would be easier on DS to 'share' rather than have to give up the nursing (but let the baby have it) since he was so attached to nursing. I had always had very sore breasts in pregnancy, but was not experiencing painful nursing so I didn't worry about it. Then one day DH said you know, maybe you should wean him now and he'll forget by the time the baby comes... I actually posted a thread here asking other mamas about their experiences with
tandeming vs weaning the toddler. I also talked with my mom (who had done it both ways herself).
Anyway, my final conclusion was to wean him (completely) over the course of about a month. So it wasn't cold turkey, but it wasn't super gradual either...I did it in several stages and spent 3-6 days in each stage. (I blogged about it and would be happy to share the posts with anyone who is interested--just PM me since it's a UAV to post my link

) The short version is that I weaned him at 28m. He was not happy about it, but he wasn't a crazy wreck either, you know? He cried about it a few times and got mad at me, but he accepted it.
Incidentally, as we cut back the nursing (and then stopped) my nipples got more tender...so by the last few days of nursing it
was painful. I guess it was a matter of what they were used to, and without the regular use they got less tolerant...
Now it's been almost 5 months since the weaning, (baby is due pretty much anytime). In the last month or so DS has developed a fascination with my breasts. He is constantly shoving his hand down my shirt and telling me that he wants to "just hold the nurns." He's asked me to take off my bra so he can hold them (he's a very verbally precocious 2yo

) One night I was snuggling him in for bedtime and he pulled up my shirt and discovered that I was wearing a nursing bra (I don't have many regular ones left!) so he unhooked it and nuzzled with my breasts for a few minutes. I was half asleep and didn't notice at first, then I realized that he was mouthing the nipple--I looked down and saw that he was trying to nurse, but he very clearly seems to have forgotten how to latch. He sortof smacks his lips on me a couple of times and then matter-of-factlly announces "the milk is all gone, I drank it all gone" and goes back to just cuddling.
I'm not sure exactly what will happen when the baby gets here. I've tried to tell DS that the milk will come back when the baby comes, but he always just repeats "I drank the milk all gone" so I don't know if he believes me. I suspect that when he sees the baby nursing he will want to try it some more himself, and I think I will let him--if I'm correct about him forgetting his latch then I figure he'll be unsuccessful and get over it before too long. Perhaps he will conclude that his milk is all gone and that only [baby's] milk is in there. He has started drinking cow milk (which he seems to really like) so he may not actually like the taste of breastmilk anymore, since it's so much sweeter.

i'm just playing it by ear!!
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