Same problem here. I have to kill the process manually.
strace reveals it's polling all the time (while I guess it should just wait for 
events)

{{{
poll([{fd=6, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}, 
{fd=16, events=POLLIN}, {fd=15, events=POLLIN}, {fd=18, events=POLLIN}], 6, 
101) = 0 (Timeout)
gettimeofday({1270047222, 23323}, NULL) = 0
gettimeofday({1270047222, 23383}, NULL) = 0
gettimeofday({1270047222, 23432}, NULL) = 0
gettimeofday({1270047222, 23485}, NULL) = 0
futex(0x9142bc0, FUTEX_WAKE_PRIVATE, 1) = 0
gettimeofday({1270047222, 23617}, NULL) = 0
poll([{fd=6, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}, 
{fd=16, events=POLLIN}, {fd=15, events=POLLIN}, {fd=18, events=POLLIN}], 6, 
100) = 0 (Timeout)
gettimeofday({1270047222, 123873}, NULL) = 0
futex(0x9142bc0, FUTEX_WAKE_PRIVATE, 1) = 0
gettimeofday({1270047222, 123951}, NULL) = 0
poll([{fd=6, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}, 
{fd=16, events=POLLIN}, {fd=15, events=POLLIN}, {fd=18, events=POLLIN}], 6, 0) 
= 0 (Timeout)
gettimeofday({1270047222, 124067}, NULL) = 0
gettimeofday({1270047222, 124114}, NULL) = 0
gettimeofday({1270047222, 124162}, NULL) = 0
futex(0x9142bc0, FUTEX_WAKE_PRIVATE, 1) = 0
gettimeofday({1270047222, 124241}, NULL) = 0
}}}

-- 
desktopcouch-service hangs with 100% cpu
https://bugs.launchpad.net/bugs/552561
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