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I can't find anything in the rules other than what Betma said or what's in the PHB 3.0, which says exactly the same thing. RAW, it would seem that indeed, casting another spell even if you have charges left on Touch of the Harrid would cause TotH to dissipate.

I could see an argument for touch spells with multiple durations, but I suspect there is a reason for that rule in the first place. My guess (and it is completely my own opinion, a mere hunch) is that it might be considered overpowering otherwise, rather like a 'free' quickened spell. If you hold the charge then cast another spell, you can hit a mook with both at once. Sure you used up an action the first round, but imagine: your group is fighting the BBEG, and you've taken cover behind a fallen archway. Knowing you can do nothing at the moment until the smoke clears from the last explosion, you spend a few rounds charging up touch attacks with durations. When the smoke clears, there's your chance: you leap out, smack the Big Ugly in the face, discharge five spells, and toss a quickened Lightning Bolt into the mix for good measure.

Hitting a mook with six spells at once should be the province of 9th-level spells such as Time Stop. I imagine that's why the rule is there, and similarly why there is no explicit mention of an exception for touch spells with durations. However, I'm not certain there *are* all that many touch spells with durations, so perhaps you would feel this would not be overpowering.

I have a tentative feeling it's a bad idea, but not strong enough for me to actually *advise* that it's a bad idea, so as Betma says: never let RAW stand in the way of fun. I will offer this caveat: if the designers felt that a touch spell that expires after it discharges would be a bad thing to keep holding while casting another spell, how much worse would a touch spell that *doesn't* expire be?