This is how i do it:
1. Sale
2. Send invoice if havent paid within 2 days (otherwise nothing)
3. Mark as payment received when direct bank deposit received, otherwise paypal is auto
4. Post item and mark as posted.
Notes:
Items are usually posted same day of sale if paid, otherwise 1-2 days later when i get to a post office. Usually arrive at customer 1-2days, longer if in Perth etc.
Some people then email if havent received in 2 days asking if been posted and i simply reply yes, posted "date"
My rating is 4.7/4.4/4.3/3.8 with postage fees being lowest because i rip ebay off

Feedback: feedback.ebay.com.au/ws/eBayISAPI.dll?ViewFeedback2&userid=phasercomputers &ftab=AllFeedback
I Don't seem to have to many complaints, only some from potential buyers who have a whine about paying $10 postage when they win the item for $1.
cheers