Chandu,
I know what patches are available from SAP, the question was where do you find the Content Server patch level after you install it. Which on playing with the system last night and monitoring the various screens I was able to find after all. In transaction CSADMIN select the content store you want to patch, on the Statistics tab there is an entry, ServerPatch, this value coincides with the patch level of the content server. The answer as to wether the patches are cumulative or incremental I will find out in a couple of hours as I decided to patch the server under the assumption that patches where cumulative. I will know after the users test the patches I applied last night.