Here's a scaled-down version of what I do, step by step. It takes a bit of work to setup, but once you do it'll streamline the overall process.
Setup Phase
1) Setup Bookmarking Demon Project - BMD is now in version 5 which supports projects. Create a new project called "Profile Fastindex" or something.
Inside this project setup 10 Bookmarking accounts. You can put all 10 accounts at one site like Propeller, or spread them between Propeller, Digg, Oneview, etc. The key here is that any site you use must give you an RSS feed for your own bookmarks.
2) Initial Manual Bookmarks - Bookmark something (anything) at each of the 10 Bookmarking accounts you setup. This is just to get the RSS Feed started, as empty RSS feeds cause problems when working with them.
3) Mashup the RSS Feeds - grab the RSS Feeds from each of your 10 bookmarking accounts and mash them together with Yahoo Pipes to create a new RSS Feed.
4) Submit your Yahoo Pipes RSS Feed to a bunch of RSS Directories (Aggregators) using RSS Submit.
Your setup phase is now complete. You now move on to the Bookmarking Phase. Here's the steps:
1) Profile Link Creation - after you create your profile link, grab the URL for it and throw it into a text file. Do this for each of your 400 profiles.
2) BMD 'em - Copy and past the entire list from the text file into Bookmarking Demon in your "Profile FastIndex" project and do a run, bookmarking each profile. You need to change the settings to make sure it bookmarks 100% of your links unless you are going to do 2 runs or you'll miss some.
3) Ping Your Mashup Feed - after you're done, ping your Yahoo Pipes feed with either Pingler or Pingomatic.
That's it!
Everything else works automatically from here. The profiles will be bookmarked across your 10 Bookmarking accounts. They'll then be all mashed together again automatically using their RSS Feeds and Yahoo Pipes...and if your feeds is accepted at 100 RSS Aggregators you'll now have hundreds of links pointing back to the various profiles.
It'll be almost impossible for them NOT to be found.
If you thought this was helpful, please throw me some thanks.