Currently the tokens the Boo Lexer returns during parsing do not have "satisfactory" lexical information, in my opinion. Yours may differ, because I haven't given my opinions a tune-up in a couple of days.
For instance, there is currently no way to tell how long a token is: 'ziggy think she\'s so hot' is in reality one character longer than a hacky work-around of using Code.ToString() would suggest; parsing tokens like these "by hand" would inevitably defeat the purpose of using the boo parser in the first place. 
There is also no "end" lexical information, which is disappointing. ;(
I would like to see these improvements added:
*a length property for all parsed tokens
*token beginning and token end lexical information.