You can also check your Yahoo Groups on their home pages. I belong to 20 or so groups, only check them out this way. I can skim the subjects, read those that interest me and move on to the next one.
On HOYardSale I just check out the messages on the home page, as I really don't have any need to buy new HO stuff. I mostly look to see if someone is looking for or offering something that I might have. But it's been discouraging, as I sometimes see brand new models that are out of production being offered for half or less of their new price. I'm not really interested in selling anything I have for half of what I paid for it.
I did have some successes selling off a few of my custom painted models, but always wondered if I'd priced them too low as they went pretty fast. At least I did get what I asked, not like eBay where something might sell for a low price if not many people discover the auction. Always a gamble!