I had read/ heard from somewhere that there was a connection between Thunderstone and AltaVista. (I'll be danged if I can find that reference.) I have been all over Thunderstone's site, and I can't find a single reference to AV, but I can find one reference to ODP.
Somehow, I think I might not be the only one here who knows, but here goes:
One of their clients is dogpile, aka subsidiary of infospace. I have no idea why they use the spider technology to power the dogpile directory, my guess is so that they have some original content.
And I dont' have any info on this other than what happened with one of my sites the pages were spidered by thunderstone, and then soon after appeared in the dogpile directory. No other bots hit them that could have accounted for this.
Is there any hard and fast info on this subject, or is this empirical evidence all we have to go on? (is that the right word?)
The only thing I know about Thunderstone is that once they spider your site, you can go in and have it placed in any category in the Thunderstone directory you want, and if I remember correctly, you can also write the description for it.