Thanks for your reference naomi, i've just seen this post,
Clanad, <b/>a very good answer, as usual, i'll try and go a bit further, while at the same time, as short as possible.
Obviously, the lifestyles and worship of the two groups are seperate, but interlinked within themselves.
eg, Orthodoxy does not allow the worship together of male and female, Reform does, Orthodoxy, during the females menstrual cycle deems the female 'unclean', therefore she has to sleep in a seperate bed/room, and use a 'Mikva' to regain their cleanliness, (bath or washing bowl) Reform doesn't.
Ultra-Othodoxy, eg Hassidims,generally do not recognise Reform Jews as Jews.
Ortodox Jews tend to keep to themselves more than Reform,
I'm afraid there's so much to answer on a question like this one, i'll stop there, but if you want any speciifics, please come back, and i'm sure I can lean on Clanad to help out.