I've recently hit a personal mile-stone with Adsense (thanks mostly to WebmasterWorld) and although I'm not earning a huge amount compared to some here, it does make a difference to me.
I am however, earning this money primarily through one hobby site, which scares the hell of out me!
My biggest fear is that one day the dollars will stop coming in for whatever reason, be it a change to Google's business model or to competition.
I kind of rely on a part of what what I earn each month, but what would you say is the sensible thing to do with the earnings I don't spend?
I'd like to re-invest in to something more stable and maybe even increase my existing earnings further.
Edit: I also work full-time and save a little. I'm looking to re-invest maybe $300 per month.