My area of "things you wish you knew" is in terms of professional and graduate school and their applications. Theres so much to talk about like taking easy courses rather than ones that you think will impress your med school, not worrying about your major, secret work arounds to the course requirements for med schools etc... I think I'll right a large series of blog post outlining as many of these as I can.
Source: I'm a graduate student, ive gone through the whole mess of undergrad and applying to graduate and professional (mainly medical) school. If your interested in grad/med school for the future and you have questions, visit my blog www.insideminds.tk and leave me a comment or pm me on this forum. You can subscribe to the blog via email, which will alert you when I start posting all my insider tips on grad/med school and applications. I usually answer questions within a day or so. good luck