best online courses to improve my swimming (freestyle)

I'm trying to improve my swimming. I can swim for 2km without any problems, but i'm not having a great distance per stroke (1.71 meters = 5.6 feet) nor a very good pace (2.4 seconds /cycle)

i'd like to improve this.

can someone recommend some video training? or books?

i heard that total immersion and swimmingsecrets dot com have some interesting video tutorials. are there any others? would you recommend one of those two? Also, i'd like a gym training program for freestyle (if u can suggest one).

Thanks,

M

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