Build tools and apps – If it is possible and is in some way related to your site, than its always worth spending in building tools. Say if you have a mortgage site, than build a mortgage calculator. If you can’t code, than hire a Coder from www.rentacoder.com, www.elance.com or www.getafreelancer.com and pay him $150 to get one. Try to get something flashy or some web 2.0 using ajax or javascript libraries. A additional $50 can really make lot of difference.