Heading to Tulamben in Sep for my third visit - Liberty Divers are great - great service and dive guides.
My advice is do an early morning - 6:00am - on the wreck before anyone else does and it is a fantastic dive.
If you are into macro and underwater photography then Malaste and Seraya are absolutely fantastic but they are true muck dives - i.e. no pretty corals etc but the macro life is fantastic. Malaste is about 10 min from Tulamben and Seraya about a further 5 mins on. Both of these sites are double dive sites to get the best out of them.
If you stick to Tulamben Bay only there is the Drop Off which is great with corals etc and as it name says is a big drop off at the southern end of the bay.
Coral Gardens is around from the Drop Off and is a nice dive with a cleaning station at the 30m mark. Then there is Wreck Slope which is between Coral gardens and the wreck.
Kubu is to the north of Tulamben - about a 5 min drive and is a double dive as well.
Batu Kelibit and Allam Anda are two sites just out of the bay and you have to pay the fishermen to take you out on their Junkungs - about a 5 min ride - and are well worth it. Cost is about $10USD which goes to the fishermen and LDR will arrange the fishermen. If you do Batu Kelibit make sure they drop you on the rock otherwise it is a bit of a swim
Every site is different and has something to offer almost every diver.
Here is an article that I wrote and had published in Sport Diving Magazine here in Australia - hopefully it gives you some good info -
http://www.divetheblue.net/pdf/148Tulamben.pdf
Enjoy Tulamben it is a great place and LDR are great.
Karl