The original 64MB SODIMM was just too little for my applications - ZoneAlarm, AOL 7.0, NS6, etc. I ordered a 128MB SODIMM at http://www.oempcworld.com/item.jhtml?UCIDs=66527%7C1037393&PRID=968691
The spec is:
128MB 144pin SDRAM SODIMM 16Mx64 non ECC, gold, 3.3V, PC100 spec, 100 Mhz, CAS 2 latency, 1.15"
Just remove all (about 12?) the screws holding the board down. Pop out the 64 MB, Pop in the 128 MB.
I went with 128 instead of 256 because of the threads here and other GLXV-200 based systems as seen here http://www.advantech.com/products/PCM-5822.asp which kind of confirm the 128 MB limit (at least to me).