I was in your same situation-new baby boy born in September as big brother turned 3 two weeks later! I am not going to kind you, at times it was tough, but it also wasn't as hard as you might imagine.

Since most new babies eat often, I read to oldest ALOT while feeding baby. We went to library every week and picked alot of books to bring home. Also had a kiddie size table on the deck, and oldest played with playdoh while I sat nearby. He made me "food" and many other great things!
How about puzzles? Coloring and coloring books? And don't for about shopping at consignment stores-good prices on toys and young kids usually don't care that they are not in the original box.
Don't know if your guy is going to pre-school, but that also helped to tire my guy out.
Good luck! and enjoy! My two boys will be 14 and 17 next month and are good friends-hope the same for you!!

My children are all 1-2 years apart and I never segregated them from one another. I realized how overwhelming it was to have a lot of toddlers underfoot so I turned them into Mommy's helpers. I would say things like, "Can you hand Mommy a new diaper so I can change the baby? Will you sit next to me and the baby while I read him a book? Can you help me sing the baby to sleep?" It helps to reinforce the idea that a siblings' role is almost as important as a mommy's. Now my children are extremely close. They have their occasional conflicts, but most of the time they are the best of friends. Good luck!

My boys are three years apart. I don't remember thinking of new things once the baby arrived. First, my eldest son continued to go to daycare. Keeping his schedule consistent was important. It helps that a baby sleeps a lot and I just carried the baby with me wherever I was with my elder son - in my arms or in a carrier. The second one seems to quickly get used to going along for the ride. Lastly, it was a good time for my husband to step up and spend more time with my three year old and it was also the time that he had to learn to play by himself.

My son was just over 2 when my daughter was born. If Edwin is still napping, try to get them on the same nap schedule eventually, so you get a little bit of a break. And get a carrier or a sling so you can hold the baby hands free. We spent as much time as possible outside.

As for toys, when mine were that age, a pile of dry pasta, some paper and a bottle of glue kept them occupied for ages. Play Doh. And lots of building blocks.

My son was just about 3 this spring when I had our second. He probably watched a little more tv than normal :) I purchased the entire Hi-5 series (I didn't know about this until he watched it daycare and would be talking about it later--great show for toddlers) on DVD from Amazon and that would occupy him for hours if I was too exhausted. Also, I found a "fingerpaint" set of clear gels which only produce color on special paper. I think it was from Crayola, similar to the Color Wonder markers. And I will admit that I still sent him to daycare most days since I didn't want to disrupt his normal routine too much. Good luck!