Of all desktop processors, the Celeron has had the most ups and downs. At its first inception, it was such a horrible processor that you couldn't pay people to use it. Later revisions proved to be the most popular chip on the market, especially for overclockers. Since it hit the Prescott-core base, it's been pretty hum-drum, with nothing of particular note and prices that don't scream "buy me". Lately, Intel has looked to beef them up a lot. On top of making dual-core Celerons available in the future, Intel is also looking to beef up the CPU itself.
The Celeron D 352 and 356 are on their way next week, and will have clock speeds of 3.2GHz and 3.33GHz, with 512kb L2 cache(double that of current Celerons), pitting them on part with the mid-range P4s of last year and making them the fastest Celerons yet. A few months down the road, a 3.46GHz model will be released. Depending on prices(which initially look quite good at $79 and $89 for the ones being released next week), that may put them in a position to become the favored low-end desktop chip, on top of having a 65nm process to boot.