I was the 6th person to comment on this thread, and yes, its mostly smooth sailing after tropicraft. kinda ironic that you have to leave paradise to be happy.
the forums keep temporarily becoming unavailible. Also, I heard the technic guys bought another mirror server? havent seen much evidence of that as far as download rates go. Are there just so many people attempting to download it dosn't matter? That would be interesting.
Its funny, I just remembered about Attack of the B-team at about 2:58 p.m. today. I was at the technicpack site at 3.
I guess I needn't have bothered, with how long the download is taking.
When it fails, just hit play again. If it dosn't work, try again. It will eventually succeed in downloading, and deleting it just makes you have to download everything all over again. Be patient.
If you don't want to delete the entire folder, then you can delete just the following items:
CoFHCore-1.5.1.5.jar
Galacticraft-1.5.1-a0.1.34.186.jar
immibis-microblocks-54.0.9.jar
[1.5.1]TreeCapitator.Forge.1.5.1.r01.uni.coremod.jar
If you delete those files, your tekkit should start up just fine.