If you're nursing, remember that night-waking may go on a little longer than for a formula-fed baby. Also remember that the definition of "sleeping through the night" is only 6 hours of sleep!
At 8 weeks or so, you should be getting the 6 hours. I wouldn't expect the 8-10 hour stretch until the little darling is 12 weeks or 12 pounds, and even then you'll get occasional interriptions. I had read the thing about 12 pounds somewhere and thought it was funny because I'd never heard about weight having much to do with sleeping all night. However, when I looked at my kids' scrapbooks, etc., I noticed that my son slept 8 hours around 10 weeks, while my daughter didn't until she was 15 weeks. That was exactly when they each were about 12 pounds!
As far as tactics on getting the child to sleep better at night: Routine, routine, routine and become a nap nazi. An over-tired baby will not sleep well, if at all. Regular naps are as important as regular feedings. The Babywise routine of sleep, eat, play is a good one. You'll want to set a morning feeding time if you haven't already. Then do the rotation with feedings every 2 1/2 to 3 hours during the day. Babywise seems kind of militant about the 3-hour feeding routine, however my son never really followed that schedule, and I found I just wore myself out trying to force it on him. He would actually nurse every 2 hours in the morning, with just a cat nap, then take a giant mid-day nap (like 4 or 5 hours) then cluster feed in the evenings (every hour between 5 and 8 with a cat nap in the middle of it all) then sleep for about 10 hours at night.
Of course, there's always this theory:
Until they're a little older (like 5 or 6 months) I think all the tactics are simply to make you feel like you're doing something about it. Babies will sleep all night when they are ready to. There comes a point where they may need a nudge in the right direction, but it shouldn't take a lot of effort.
Good luck!