talk about finding ways not to do the things i'm sposed to be doing lol ahhh well ive had fun
I used thunderbird and a thing called freepops
http://www.freepops.org/ then set it up to find yahoo accts (it will let you do this with heaps of different web based emails) so when thunderbird checked for mail it found it.
Set a filter to forward any mail addressed to me to be forwarded to gmail, and it worked. Oh and the mail came into the main inbox tho it looks like you can set rules on any folder.
Hope this is of some assistance