*chuckle* guess i'm gonna buck the trend and actually be a chick posting
*chuckle*
warrr... how intimate? if it's friends, she's tellin' you about her newest boyfriend and her littles and her mom and stuff, i wouldn't worry about it. I'd mention you were talking to her, and if you found something interesting, share it with your wife, both as a gesture showing you're not hiding anything, and jsut as a way of including her in this new bit of your life.
If she's telling you waht kind of lingere she's wearing, I'd be weary, 'cuz that stuff is NOT gonna go over well with the wife. I don't know your lady, but I guarantee that she doesn't think that things like that fall within the "old friends" relationship.
long and short: tell her about it, mention it casual. oh guess who I've been talking to lately? Jenny! did I tell you about her? we go to gether from way back!
isn't that cool?
wahtever, that sort of thing. make her feel comfortable, and don't be afraid to answer questions. chances are your wife doesn't really care if you talk to old friends, so long as you avhe time for/pay attention to her, and it's her you come home tol. good luck!
PS: the fact that you are worried is awesome, 'cuz it means you care. maybe explain that you were concerned about how she'd feel about it, and wanted to be open? Maybe that's too sissy for a man, can't tell.