Hey, I applied to Creighton too, but didnt get that letter (I've gotten nothing so far). I enrolled in medical science masters program when I did not get admitted after undergrad. It is 2 yrs long, 34 credits, including a masters thesis ( i finish in April 2006). It sucks, but I am doing pretty well, and I am admitted for 2006. I do not think that if you do post-bac, that they will automatically admit you b/c each year is a new cycle and everything starts over. But it may help to get you admitted for the next cyle. If you do post-bac, make sure it is a masters program and not just classes at some noname school. Also, I have talked to numerous schools that like the medical sci program (I have taken classes such as: biochem, anatamy lect & lab,pharmacology, microbio, toxicology, endocrinology, and pathophysiology). Basically, it cant hurt to do it. A lot of dinguses on SND say NOT to do post-bac, but I have called each and every school that I applied to (20 of them), and asked. Pretty much all of them liked the program (ie: look at U of Pitt website under reapplicants). I do not know where u are from, but I know that the med sci program is offered through some med schools, ( I'm doing mine at Wayne State School of Medicine in MI).
Good luck, if you have any other quest, feel free to ask.