I really love Spark and wanted to help out any way I could, so I made the SparkPeople Web Search my home page instead of Google (which it used to be).
One thing that kind of gets to me though is that when you search something, it opens in a new window. Maybe it's just me, and I know this isn't a huge thing, but maybe it could open in the same window? I want to support you guys anyways I can, because you offer such a fantastic site, but I use google a lot for research and I always end up with a ton of open windows (hard to keep track of and messy).
Keep up the amazing work - we all really appreciate everything you do for us!