Oh, I do sympathise!
It gets better, but it wasn't sustainably easier for me until my DD was walking with a degree of stability. The initial independent steps were a false dawn as a) she kept falling over b) DS kept tripping her up for what can only be described as his own entertainment.
So ... you're at 2.5yrs and 8 wks. Very tough. It probably won't be any tougher than this (although watch out for feelings of complete crapness and despair in April 2010). I predict you'll have a lovely spell in about 12 weeks (DD2 sits up and holds stuff / DD1 enjoys passing her toys and making her laugh), but that bit then segued into quite a difficult period when my elder child decided to test every known boundary. Just as I was getting through that, the baby wanted to walk everywhere (screaming if this was denied), but needed help. This effectively took up both my hands, which then led to DS's escapologist phase.
I was clear by 14 months. By clear, I mean: really happy and doing very well. I thought I was doomed at 8 weeks. 11 months was also pretty shite.
I hope this isn't just the worst possible thing I could write. I was immensely comforted by other people telling me how overwhelmed they'd felt when no.2 arrived, you see.
Erm, so some advice as well: lots of good stuff on here. I also used to make DD's feeding times a mini treat for DS. That was a lifesaver. He could watch whatever terrible crap he wanted to on tv and eat something vile and sticky (although I'm still living with the bad habits it created, so proceed with caution).
He also liked me having a wee moan about DD, and asking for 'advice' when she was crying. I would say something like, "DD is making lots of noise, isn't she? It makes my ears hurt. Do you think she might be hungry or tired? She's only a little baby who doesn't know how to make herself happy, so we should try to help her." ... and then he would heartily agree that she was noisy and annoying, then make a helpful suggestion like, "Why don't we leave her here and go out to the park?". We discussed why this wasn't such a good idea and he soon realised that feeding or cuddling her was a quicker solution. In fact, on the occasions I was irritable with her (not proud of it, but there you go), he would then parrot my recommendations back to me, reminding me she was just a little baby etc.
Mainly, though, be kind to yourself. It's difficult x