Nothing wrong with doing like AussieDomainer and flipping them now, but for those whom are holding them for the future, carefully think about the total cost of ownership.
$7 in 2008
$8 in 2009
$9 in 2010
Rough guess at wholesale registrar fees (taking into account annual Verisign price hikes or lost interest should you choose to register them for multiple years now).
That's $24 over 3 years. That doesn't account for the lost opportunity cost. If you resell each of your LLLLL.coms that you registered today in 2011 for $50, you'd only have achieved a 100% ROI. Pretty easy to get that over 3-4 years in alot safer domaining investments.
On the other hand, suppose you got that name in 2009, now you're only paying $17 versus $24 and have doubled your ROI.
The question is of course timing. Some people started regging triple premium LLLL.coms right after quad premium LLLL.coms ran out and are selling their triple premium + J, which they've paid $20+ renewing over the last 3 years (2006,2007,2008) for $60, while I sell my triple premium + Q (which I regged in August 2007 for $7) for $40+.
My Profit: 6x costs
Theirs: 3x costs
So even though they might have a better name and get a bit more for it, I end up with double the return they do, just for timing the market a bit better.