My site also does not tell me when the spiders visit to reindex. The only way I know is if I see an updated page in the cache. But even then its hard to tell.
The reason that I am concerned about the updated pages in the index, is because I have optimized my pages to provide more info to users and to hopefully get a higher listing. If Googlebot doesn't visit those pages and update the index, then they won't list my site higher for the relevant searches.
I still try to build links and add content. I've also taken Vista's advice and made better title tags, begun writing articles and so on....but Google doesn't know about it yet, because they haven't visited my interior pages for a long while.
All you can do is update your content and hope that they will visit and cache your site. You can not speed up their process. You need to worry about optimizing and link building correctly to get all your pages indexed. If you do it correctly, Google and Yahoo will visit your site daily. They visit mine every 2 days checking for updates. They like to see fresh content. Stop worrying about it because you wont be able to change their speed unless you take the time to make your site a useful piece of information that the spiders like!
I guess the problem is, it is difficult to add fresh content all of the time...my site does not really change that much unless I rewrite some copy, add a product or add an article that I've written...
Overdrive, What kinds of things do you do to add new content?
Vista, I've seen that you've written a lot of articles about SEO techniques...are those articles only on your site, or do you submit them anywhere to get more exposure for your services?