Hi Tweets,
Some time ago Luke Cole asked about programs for graphing birding data. =
I may have missed the reponses to his query as I was on "no mail" for a =
while, so I hope I'm not repeating what someone has already responded. I =
am not sure what level of complexity in graphical representation is =
sought. So...

Thayer's Birder's Diary(Version 2) does offer two types of graphing =
options. You can graph observations of a species by location and day =
over a year, and you can graph species by location and month over a =
year. There are no options (that I'm aware of) for putting more than one =
species on a particular graph.
Usual disclaimer: I have no financial interest in this product.
Cheers
Gail Spitler
Johnsons Landing, BC
gspitler at awinc.com