lol.i am yet to get my first payment......hope it will be soon.......then i'll think about what to do
My sites are about travel, and I gather the content while traveling, so I use the Adsense money to pay for vacations. That way it's basically like getting free travel in exchange for a bit of puttering on the web. Last year it was enough for one month around Europe, hopefully some year soon I can fly business class!
About 2 years ago when my Google lost my homepage and I spent one month in SERP hell, I suddenly lost Adsense income for one month and it hurt. So now, Adsense money goes into investment, stocks and savings. Boring I know, but better than worrying each day if the Adsense tap will run dry ;-)
Most back into my sites, advertising, hosting, a little to my missus to stop her from complaining LoL.