>I've just developed a new site, but very wary of spamming.
Have you tried searchenginewatch.com? I think they have
a fairly recent chart on that. Of course SEW tends to
quote the official SE pronouncements these days, so
you may be asking how much more aggressive one can be.
I haven't tracked this in months, so I may be all off.
Corrections welcome. But except alltheweb.com, I'd say
you could safely submit 10 pages a day to most any
SE. (Yahoo of course only takes the index. Unless they
love you, but I don't know that scenario well.)
Not sure what resubmitting does unless you've changed
your pages. Bots do return; some of them, anyway.
See below ...
<general rant>People should spend more time looking at
their logs, and I mean raw logs. See what the bots are
doing. Get a feel for it.</rant>