English Central is a great site for practicing your sound in English and getting valuable feedback about your accuracy. And they have soooo much stuff!
Today I found this slide show on Slideshare; it was linked to eflclassroom.com
I often ask my clients to practice great speeches; they should match the pace, pauses and intonation of the speakers. This slide deck has cloze exercises for many historically important speeches, so you can get a bit more value out of your practice: not just how you sound, but whether you understand and use the vocabulary and sentences well.