Yeah.

We're using a Microchip ENC28J60 (10Mbit MAC+PHY) mainly because we're pin bound on a project and this thing uses SPI, but it requires only a couple of caps, resistors and a RJ45 (integrated magnetics).

What's more, if you were to pick a suitable PIC, microchip have a TCP stack that you can use straight up.

The ehternet chip is available in a 28 pin DIP from farnell at around £5 a pop.