I thought I'd post a few ebay tips here (I hope no-one minds)
Basically they are tips I've learned along the way through my own experience (some at a cost!)
I'll keep popping back as and when i think of more tips (unless someone disagrees with what I'm doing) and I thought it could be a good thread for others to join in with, with their tips.
I'll start with packaging.
If you anticipate selling quite a few items it is worth buying a large roll of brown paper from an office supplies (eg Staples) than buying a few sheets from the PO. (I get 25m long roll for under £6. I think it costs a couple of quid just for a few sheets at the PO)
Bubble Wrap - have a look in the fruit and veg section in the supermarket, they throw it away. You can always ask if it's ok to take some (so long as you don't empty the apples on the floor) It's clean, doesn't smell and just by collecting a few sheets with your weekly shop can really help out.
Save cardboard from some pakaging eg some biscuit packaging comes with lovely plain cardboard - ideal if you need to post something that requires support eg CDs.
All of the above can work out much cheaper than buying jiffy bags.
If selling a lot of clothing items, have a look on ebay for the plastic mailing bags - they really do work out quite cheap (posted to your door too so no petrol costs)
Add a little note in with your item, either hand written or print a few off. they don't need to be big (I print 8 on one piece of paper) just saying thank you for buying and include the URL for your listings or ebay shop. people love getting notes
Remember to write the sender addy on the back of the parcel - just house number and post code.