Identifying Weeds??..

I know it aint everyones favourite subject,BUT...I`ve been thinking....well hoping really,if everyone would join in and help people like me, who arn`t too clued up on all the various kinds of weeds,in identifying,maybe(please)posting pics, and giving advice on the best way of getting shot of them.I know wildflower will probably go ape when she reads this thread, but i think a single thread on this topic could be a great reference and extremely benificial to alot of us.
I realise it will take time,but seeing as though this is their (weeds)favourite time of yr we could pack alot in, in a short time.
I know i have a FEW at allotment,which i would dearly love to know how to deal with....

 

Here's one of the many sites available with descriptions and pics of common weeds:
http://www.dgsgardening.btinternet.co.uk/valerian.htm
Quite a few are herbs as well.

 

There's a very good book which identifies the seedlings too...
http://www.amazon.co.uk/Colour-Atlas-Weed-Seedlings/dp/1840760389/ref=sr_11_1/203-3034469-2720705?ie=UTF8&qid=1174920840&sr=11-1


I'm sure I've seen sites with this sort of info to, but this book has been useful for me.