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With our DD we basically started cutting back on the number of bottles she got. Though, I will admit that once she was really eating solid foods the bottle didn't hold much appeal to her anymore, and when she figured out she could drink out of a sippy, she basically tossed the bottle. But, when we did start out to "wean" her we cut back so she'd have a bottle in the morning and a nighttime bottle. Then, when it just became easier to feed her at the table the morning bottle got replaced with a sippy. The next thing we knew she just didn't care to have that nighttime bottle. When you do start cutting out the bottle, though, stick to your guns. The best thing is going to be consistency. We also found simply having a sippy of water around all the time helped DD (we picked water so it wouldn't "go bad" during the day). I'd say maybe making a big deal, too, when your son uses his sippy... something like "wow, what a big boy you are to be drinking from a cup!" or if he's complaining about not getting a bottle saying something like "you're a big boy now and big boys drink from cups". Our DD really ate that up. Good luck!

We did it in stages along w/ the easing off on formula. When he started eating more real food we only gave him a sippy (no bottles) during the day. Then we cut out the evening bottle and replaced it w/ a sippy. Last to go was the morning "just woke up" bottle, which we replaced w/ a sippy cup of milk just after his first birthday. It took a day or two to get used to, but he really didn't fuss much. I think the trick was not changing the timing. He got the formula (and then the milk) at the same times and in the same places that he was used to, just in a cup instead of a bottle.