I recently heard of this strategy for making some quick gold.  It requires an understanding of the raiding patterns of your server:

“Monopolizing the epic tailoring enchants is a great way to make money.

On my server, wednesday and sunday are the prime raid days. My own guild doesn’t raid on wednesday and on sunday we’re usually out of content by 10pm, so I’ve made it a habit of popping into the AH around 22:30 to buy out all the [Brilliant Spellthread] and [Sapphire Spellthread] and relist them with 500 gold margins.

When the raids end, people will be looking for new leg enchants and pay premium prices for them. I make 1500-2000 gold each time and those that don’t sell, I put back up at the regular prices or just use them myself.

Having made crazy amounts of gold with cutting [Runed Scarlet Ruby] a few weeks ago when I was one of two tailors with the cut on the server, I tried the same trick with them, but it didn’t work because it’s too easy for a random JC to come in, buyout a few raw gems and undercut me by a good margin and still make sweet profit.

My theory is that there is very few tailors left nowadays and of those, not everyone can make the spellthreads. Those that can, are likely in raids and are using any mats they have available to supply guildies with threads rather than trying to make gold through the AH.”

In theory, I like the concept of timing the sale for the end of a raid when raiders will want to buff up their new gear, and to monopolize some item that there are limited quantities of (and limited producers of).  This strategy obviously requires a good deal of gold to start with, but has great potential.