Bob,
Intel has been doing the same thing since the first PIIIs went to Socket 370 Form Factor. (Might be longer.)
From Anantech:
The new Celeron core is based on a 128KB L2 version of the original Willamette core that the Pentium 4 debuted with in November of 2000. Unlike previous-generation Celerons, the Willamette-128 core is no different architecturally than the Pentium 4's old Willamette core. The cache organization and mapping algorithms are still the same, the only difference is that the Celeron core is only outfitted with a 128KB L2 cache instead of the 256KB cache present on the original Pentium 4.
Only having a 128KB L2 cache increases the Celeron's dependency on a high-speed memory bus.
Here is an article from Tom's Hardware on the latest generation of Celery:
The New Generation Is Here: Celeron 2.0 GHz, with 0.13 µm
(You can see a picture of the Core in the article.)
Here is an article also from Tom's Hardware on the last generation of Celery:
Battling Brothers: Celeron vs. Pentium 4
(There is also a picture of the Core in this article.)
Take Care,
Richard