Luckybird3
This is the link to the Screening Rooms which is on Club street in Chinatown. There are several floors of bars and they show arty films but it is the top floor outdoor bar I like which looks over Chinatown and the CBD. The links shows some pics.....
http://www.screeningroom.com.sg/fivefloors.aspx
Thanks for the info on the Screening Room, I googled their website and it looks really interesting, although the address shown is 12 Ann Siang Road (maybe there's another entrance on Club Street?). We'll definately have a look.

if you dig roof top joints, there are 2 more pretty hip spots
the Loof
it overlooks the famous Raffles hotel
http://www.loof.com.sg
Orgo
on the roof of the esplanade art centre, and it looks out to the marina bay area
http://www.esplanade.com/eat_drink_shop/dining/orgo/index.jsp
both have swanky and poser-ish crowds
hootie
The night Zoo, drinking a Singapore Sling at Raffles, just wondering the streets and taking in Singapore life. Looking from a distance where the old buildings meet the new. The food courts.
Thanks hootie - we're not at all poser-ish/swanky, but since you've suggested, might have a look (just for the views!)

drinking a Singapore Sling at Raffles,
whoa, this is not the fun it used to be, and take your bank manager in with you to get an estimate on the loan required to pay for one.