bounce rate

Personally I would consider anything below 30% for the homepage to be acceptable. For other pages this can vary widely depending upon the purpose of the page (informational, lead generation, tool, link page) and also the traffic that you are sending to each page. Try to focus on one or 2 pages at a time in terms of bounce rate instead of a site wide percetnage as this can be very misleading. Look for the high bounce rate pages and try to reduce them, look at the low bounce rate pages and learn why they cause people to continue though your site.