I must confess I know precious little about bus travel in and around Dublin and I am putting this tip up here to assist with a website and contact details for the reader etc. as well as a small piece on the one journey I do know about which is the route from the ferryport to the Busaras (central bus station).
The bus that plies this route is the 53B and actually leaves from outside the main station at Gate 16. Most buses leave from inside the complex. Gate 16 is situated on Store Street, just off Amiens Street and is well-signed. There were plenty of helpful staff there when I visited. the fare to the ferryport is €3 single, not €2:50 as some usually correct websites state. There is a small newsagent type shop on the station but if you want a drink the Brew Dock pub is directly across the road from the gate.
The Busaras seems clean, well-run and pleasant and the buses are modern and comfortable. the only slight complaint is that, serving a route where people are likely to have luggage, they could do with a little more luggage space on the bus.
Busáras is the Central Bus Station of Dublin. Designed by Michael Scott between 1945 to 1953 is one of the first post Second World War examples of the International Modern style in Europe. Currently the building is reforming in 2005.