I tried installing Transmission and I got the following error:
--->  Fetching transmission
--->  Attempting to fetch Transmission-0.6.1.tar.gz from http://download.m0k.org/transmission/files/
--->  Verifying checksum(s) for transmission
--->  Extracting transmission
--->  Configuring transmission
--->  Building transmission with target all
--->  Staging transmission into destroot
Error: Target org.macports.destroot returned: xinstall: Cannot stat: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_net_transmission/work/Transmission-0.6.1/cli/transmissioncli, No such file or directory
Error: Status 1 encountered during processing.