well, yes.................
I have worked on that very same thing, and found it very interesting.
I used a 18f2550 with 3K ram and 48K flash, and a WIZnet module for USART to network comm.
It turns out that it took several sort-of-independent functions working together.
So as a concept:
1) listen for a request for your web page......(to know when to send and what to send)
2)assemble or pull data to send, I used pages stored in high-up flash memory area, and sent with USART and interrupts
3) manipulate the network module to end TCP type connection so you can wait for another request
more discussion if interested.
don