The SVN repo has been updated. The splitpdb program now supports gzipped input PDB files and can also write gzipped output files. Example:
java -jar splitpdb.jar 1blr.pdb.gz --zipped-input --model 1 --zip-output -o 1blr_model1.pdb
This command will read the gzipped input file 1blr.pdb.gz, extract all general data and the data on the first model and write the output to the gzipped output archive 1blr_model1.pdb.gz. This archive will contain a single text file named 1blr_model1.pdb.