Here's a question for Good Beer Week. Have you ever wondered why it is that in most pubs that offer Carlton Draught on tap (which, in Melbourne, is most pubs) the remaining choice is limited to Pure Blonde, Cascade Light and some combination of Asahi, Stella Artois, Kronenbourg 1664 and Fat Yak? It's because those pubs are supplied by Fosters/CUB, and therefore are "encouraged" to serve Fosters produced or licensed beers.
Bay & Bridge, Cricketers Arms, Hotel Albion, The Pier, Railway Club, Sloaney Pony, Swallows, Rex, and up the road, the Palace and Fleece.
The other big player of course is Lion (Nathan) whose Boags, Classic Blonde, James Squire, Kosciuszko Pale Ale, Kirin, Heineken and Becks selection can be seen at The Exchange, The London and The Local (although in each case additional choices are offered - especially at The Local).
local brewery's output on tap (ignoring for the moment its ownership)?
It probably won't be the Rose Diner as, with the exception of Budvar, they concentrate on Little Creature's (rather respectable) portfolio. The one pub in Port Melbourne with the most diverse range of Fosters, Lion Nathan, Little Creatures and independant brewers output is ... The Prince Alfred. Cheers!