Personally I only really jump onto PS home maybe 3 or 4 time a month - just to checkupdates and changes. However - If a game notify's my of it having added a feature to PS Home, I usually check that out ASAP. My favorite is the BATCAVE apartment from Batman Arkham Asylum and then the Tekken 6 arcade cabinet in my std Home apartment.
Recently, I also watched the PS conference in the PS home Cinema suite - pretty cool seeing thousands of other people jump online to watch an event in a virtual environment