main reason LTC has risen and stable is rumors or expectations of MTGOX adding LTC. But MTGOX isnt going to shoot themselves in the foot and add LTC before they have the capacity to handle it- it will take additional employees and workstations to deal with the LTC load, and they're still trying to get a handle on their current workload.
Up until the weekend, BTC had hit a few days of relative stability.
Everyone got bored -- wanted something to trade.
"Heyyy, these altcoins are cheap...and I can buy so many with just a few BTC"
Crazy runs on all the altcoins proceeded.
When Bitcoin volatility and growth resumed, everyone wanted back in on the cash cow. Who wants to stick with an unproven competitor when the workhorse is moving full steam ahead, right?
Once BTC settles down again, the AltCoins will have another resurgence.
Really because LTC has remained stable and actually has risen today. Hm... should be a tip off for even the dumbest investor.