I frequently use a 5-card Past-Present-Future spread. Here's the position meanings I use;
1 = Past
2 = More recent past
3 = Present
4 = Near future
5 = Future
I generally consider card #1 and #5 to be looking at occurances or influences which have occured (or will) within the past 3 weeks. Cards #2 and #4 are usually within 1 to 2 weeks. If I need to look deeper into the past / future, I'll add a card to each end making it a 7-card spread. If I remember correctly, I got this at; http://www.tarotspreads.com
"A famous person once said; 'you can fool all of the people some of the time, and some of the people all of the time' ... but, as I (an even more famous person) say; 'if you don't teach them to read, you can fool them whenever you like!'"