There are two weeks between the start of the 2007 season and the year's first Grand Slam, i.e. the Australian Open.  That's not a lot of tournament or match prep time.  One can practice forever, but matches are a different scenario.  Some players manage to produce their best tennis by only playing a couple or no tournaments prior to a big event, but that is rare.  At the same time, winning one or both of the warm-up tournaments is no guarantee of success at the Australian Open itself.  This year, Roger Federer skipped the ATP event he's played in Doha the past couple years because he wanted to be able to enjoy the holidays and arrive mentally fresh and ready for the Australian Open.  Instead, Federer only played in the exhibition event at Kooyong and lost to Andy Roddick in the final.  In contrast, Rafael Nadal chose to play two warm-up tournaments.  Nadal was upset by Andy Murray at the first event and withdrew from his match in Sydney due to a groin muscle pull, which is expected to heal in time for the start of the Australian Open.  There is no "right" way to prepare for a Grand Slam and a new season although clearly a few matches and being healthy helps.  In a couple weeks, we'll know who had the best preparation this time around...