Here is our shop as an example http://www.etsy.com/shop/2crochethooksbut I suggest you browse around and look at a lot of them. The majority of our online sales have come from here. It is easy to set up and manage which is always nice. They are also improving all the time and even have the shop stats (how many people have visited, purchased, ect) right on Etsy now where before you had to go to google analytics. The fees are reasonable and everyone is friendly and helpful. There is a wealth of information and plenty of people ready to give their 2 cents.
The biggest down side/complaint I have about Etsy is that it seems to be mostly made up of sellers. It needs more dedicated shoppers. I am more likely to sell a supply (i.e. pattern or tarn) than I am to sell a finished project. There is also the issue that I cannot update with my ipad, they have an app for buying and for looking at sold orders ect, but I cannot list new items with my ipad which makes me sad.
I suggest selling here as the cost for one listing for four months is just 20 cents, which makes it well worth trying for sure.
Ebay has never been my forte, mom has always done the Ebay stuff. My biggest complaint is unless you run a shop with buy it now prices or decent reserves then things have a tendency to sell cheaper than I'd like. I'm the type who'd rather wait for the perfect buyer who really values an item and is willing to pay what its worth than try to make a quick buck by letting people fight for it and see how low they can get it.
Ebay shop fees are reasonable and if you want to manage a shop on there with Buy it now prices or are willing to gamble with bidding then ebay is a great place. Just remember most people on there are looking to get second hand stuff as cheap as possible.
Listia is much like ebay where you can end up getting less than you want. The highest you can set the starting point is 100 points so just be careful you don't list anything you aren't willing to part with at whatever amount they buy it at. The other point is you cannot cash out so you have to spend your points on listia. Not hard for me, I've been buying all sorts of amazing yarns on there. The hard part is resisting the urge to buy more points, so far so good.
There are no fees, in fact no money, involved at all. The only costs associated is with shipping and you can choose to charge shipping and have it covered or hope that it sells for enough points to make it worth shipping. It is very random how much you will make. Selling the same pattern I have made 700 points in one listing down to less than 100 in a listing. It depends on who wants it and how much they are willing to pay. As with any auction you need at least 2 interested parties.
Yardsellr buyers prefer no shipping (don't we all), especially on cheap items. This is because Yardsellr offers points for certain things and those points can be used to pay for the item (don't worry you still get cash when they pay) but not for the shipping.The best option is to increase the sale price of your item to cover the cost of shipping and offer free shipping and you will be fine.
There is no charge for listing items for sale and you can re-list for free as well. The listings don't last long so expect to spend some time and effort on this. They have greatly improved their re-listing with a new bulk re-listing button, just be careful about re-listing items you do not want to continue offering for sale. The site also has an etsy importer, you may or may not need to make adjustments to your items as they have a word limit and you may want to roll shipping into your prices.
I have only sold 2 items on bonanza but I have not been as active with it as I could mainly because of the issue with re-tagging every item.
Let us know if you have a favorite place to sell or shop. As always any hints, tips, comments or concerns appreciated!