That project looks doable with patience.  SD cards can be a bit tricky though.
Looks like there are code samples out there that talk about
interfacing to an MMC:
http://www.microchipc.com/sourcecode/

Here's how I would do it:

- get a pic programmer and a devel board that has some peripherals on
it... LCD etc.
- write the code to output 'Hello, world' on the LCD
- write the code to take output from a serial port and echo it on to the LCD
- hook up the GPS and get the coords displayed on the LCD
- hook up the SD card and test writing to it... are there low level
routines available for SD card reading on the PC or do they expect to
have a filesystem on there?  Not sure about that one.
- get them working together

The above stuff would probably take me about 6 months to do in my
spare time... :D

Once you have the code working on the devel board, then look into
building the circuit and dealing with all the finicky analog stuff.

On 5/10/07, Joshua Shriver <jshriver@gmail.com> wrote:
> Well I have two relatively small *hope so at least* projects in mind.
> I bought a decent GPS locator that connects to a serial port.  Though
> I dont have a laptop or portable computer to use it with. Thought if I
> could use a PIC chip to read off of the serial i/o line, provide power
> to the power pin, the PIC could parse the data, then have some kind of
> storage device attached (SD?) for storing the data.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist