Add files to svn:ignore propset the easy way...

svn_ignore.py

#!/usr/bin/env python

# Call from your SVN directory the following way:
# svn status | grep '?' | tr -s ' ' | cut -d' ' -f2 | xargs -n1 ./svn_ignore.py

import sys, os, subprocess

def svn(action, argv=[], stdin=None):
    cmd = ['svn', action]
    cmd.extend(argv)

    proc = subprocess.Popen(cmd, stdin=stdin,
        stdout=subprocess.PIPE, stderr=subprocess.PIPE,
        universal_newlines=True)
    output = proc.communicate()[0].split('\n')
    return proc.returncode, list( l for l in output if l )

if __name__ == '__main__':
    if len(sys.argv) != 2:
        sys.stderr.write("usage: %s file_to_ignore\n" % sys.argv[0])
        sys.exit(1)

    filepath = sys.argv[1]
    if not os.path.exists(filepath):
        sys.stderr.write("Error: path '%s' does not exsist.\n" % filepath)
        sys.exit(1)

    path = os.path.dirname(filepath)
    filename = os.path.basename(filepath)

    result, ignored = svn('pg', ['svn:ignore', path])

    if filename in ignored:
        sys.stdout.write("File '%s' already ignored in path '%s'.\n" % (filename, path))
        sys.exit(0)

    ignored.append(filename)
    sys.stdout.write("Adding '%s' to svn:ignore in path '%s'... " % (filename, path))
    sys.stdout.flush()
    result, output = svn('ps', ['svn:ignore', '%s' % '\n'.join(ignored), path])
    sys.stdout.write("success\n" if result == 0 else "failed\n")
    sys.exit(0)