For me, the nice thing about eBay live is not about being able to bid online (certainly you can, but sometimes with some annoying delay which costs you winning plus some auctions charges higher buyer premium for online bidders). But eBay listed all upcoming auctions together so that you can use traditional search engine to search items among all auctions. I have found this is quite powerful. (There is some similar service which charges monthly fees!)
http://www.liveauctioneers.com/ will hosts the online auction service for traditional auction houses. I tend to think their user interface is not well done, but at least you can still browse through catalog without going through each auction house’s own website!