Those jobs numbers are better, but the question is if they will continue or not. 2012 does not look promising, there's nothing you can point to and say this is why the economy will take off. In fact there are some reason why it won't, troubles in europe, china, the middle east. We've done nothing here in the US to improve the climate for business, so while we may see modest improvements for a time, it's not likely to be sustained.
Here's why it'll be sustained.
First of all, if you look at the numbers closely, they're a long-term trend. Private sector job growth has been 100-200k range for almost two years.
It can be confusing, because there's two different surveys, and because sometimes they include public sector jobs and sometimes they don't. If you include public sector jobs, the numbers are worse, because states and local governments have been laying people off. (You'd think conservatives would gleeful, because they're constantly calling for firing everybody who works for the government. But they're equally happy to point to those layoffs as evidence that the economy sucks.)
But anyway, this isn't something that just happened last month. It's part of a trend, that's accelerating.
In economies like ours, trends - either for the good or for the bad - tend to reinforce themselves. When companies hire, more people have money to spend. When people spend, companies sell more products, profits increase, and they hire more. Etc., etc.
Of course, it's possible something could happen that would throw the economy off track - but probably not what's happening in Europe. What's happening in Europe is actually a pretty good illustration of why we did the right thing here - massively increase Federal spending, in order to contain (and ultimately reverse) the damage - and what they did there (try to cut budgets at a time when their economy was suffering.)
Of course, if we try to massively cut the Federal budget, we'd get the same results here. But that's unlikely. Gridlock pretty much guarantees we're going to spend more than we take in long - at least long enough for the economy to recover.