I had this problem a few months back, I had nearly 1000 texts in 1 thread and it was getting really slow to open, but would hang and then force close whenever I tried to delete it. I had my phone plugged in to my laptop in USB mode and was messing around trying to delete smaller (but still large at 100 - 300) threads while I was doing things on the PC, and one of them went in just a few mins. I realised this was much quicker than normal. So I tried the large thread (1000 texts). I had to leave it for about 15 mins but it didn't force close, it deleted the lot. I was amazed. It seems plugging the phone into a computer in USB mode really speeds up deletion! I did this in Handcent on my HTC Legend, not sure if the app makes any difference. You must not touch the phone at all during deletion or it will force close (may be wise to use flight mode to stop incoming calls or texts). Hope this helps.
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