Hi liuce,
If you would like to play with the sGetResults web service prior to the 1.92 release then you can grab the latest code from the subversion limesurvey_dev branch.
Specifically, the files that were worked on to add this feature are:
- admin/exportresults.php
- admin/exportresults_objects.php
- admin/remotecontrol/lsrc.server.php
- admin/remotecontrol/lsrc_orig.wsdl
The sGetResults function supports CSV output. I will try to get some documentation up on the wiki this week although life circumstances might get in the way of that