A lot of you are probably aware of the various tools fertility friend has, and probably even the search tool, but I just wanted to point out a nice feature of it -- you can how other people have fared based on certain stats such as your intercourse pattern for a particular cycle, age, etc.
For the "best" timing (O-4 through O+1), 40% of charts had a pregnancy.
For just O, 31% of charts had pregnancy. O-1 was the best, though: 33%.
O-4 (20%) is better than O+1 (15%).
Assuming people are usually able to hit their fertile window one way or another, it seems like the odds of conceiving on any given cycle are maybe around 33%, depending on your timing (if you do EOD the odds are 37% or 38%), though I know we have thrown around a smaller number on this board in the past (more like 20%).
Here is the link to their search page: http://www.fertilityfriend.com/cg/index.php?c=search
btw this was just an FYI post and I have zero connection to fertility friend. I just thought some people might find it useful to explore if they haven't already. I found it interesting (though not especially surprising, I suppose) that just hitting your fertile window at all is worth more than hitting it multiple times. Also even if you have amazing timing your odds are against a pregnancy in any given month.
ETA: I am not sure if this is a VIP only feature. If it is, please let me know if you want me to get the stats on a particular intercourse pattern or anything else.