Hearting, if you get the time then hearting each others items and shops will keep everyones items relevant in the activity list. And reciprocating of course.
You can also heart the treasuries - the treasury itself and the items,
http://www.etsy.com/teams/20462/vintage-vogue/discuss/13815801/page/1even if they are other teams as it will increase your circulation and have exact same effect as above. And if the treasury hit etsys front page then the repercussions of the high viewing will filter down.
Basically, hearting other shops and their items improves your own chances of selling because many shops understand this and will reciprocate.
My favourites lists become ginormous so I strip them down when I can. i go to the last page and then deheart anything sold or that i dont like anymore. And reheart the rest. This sends everything at the back of my list right round to the front and out in the activity feed where I often see it refavourited several times. A big bonus of this is that the shop that owns that item is often aware that I have done this and then reciprocates. You can cover quite a few items doing this, which as I said above increases your chance of a sale.