AFAIK, btc-e.com is the only place to show LTC/BTC price graph. Is there a way to view these graphs for longer than the ~ 12 hours that are shown by default?
at http://www.cryptocoincharts.info you see long time chart for all alternative crytpo currencies
There is LTC Charts with some long term chart data for LTC/BTC from BTC-E and Vircurex.
Ask btc-e for the data. You can also ask me for some data (on irc or bitcointalk), but I don't have the complete set and it's only BTC/LTC pair. Here's a postgres dump of the trades I have in my db: http://www.mediafire.com/?q1iis15iv8gc7m6
Here there are some Litecoin price charts for a period of one week.