Geez, don’t bump. You’ll annoy the zoo volunteers.
(Sips more coffee)
ID number don’t matter worth a darn; use fancy permalinks and no one will ever know. When you export the blog to a WXR file it preserves the ID so renumbering them will be virtually impossible.
See Otto’s post here and that thread for some info.
If you want to start from scratch anyway and re-import your posts, pages, and comments then try exporting, changing your table prefix, and start anew by re-importing that WXR file.
Backup your files and database and store it in a completely safe place.
http://codex.wordpress.org/WordPress_Backups
http://codex.wordpress.org/Backing_Up_Your_Database
http://codex.wordpress.org/Restoring_Your_Database_From_Backup
Export your blog into a WXR file.
http://codex.wordpress.org/Tools_Export_SubPanel
Now comes the fun part. Edit your wp-config.php file (you did make that full backup, right?) and change the table prefix from whatever you had to something else.
So if the line read
$table_prefix = 'wp_';
Change it to something else (vb for video blog?)
$table_prefix = 'vb_';
Now visit your blog. Don’t freak out! But do re-install your blog. The tables are all new and empty so you’ll need to re-activate your plugins, select your theme, widget, set the options, etc.
Your old blog is 100% still there and intact but by changing the table prefix you create a new set of tables.
Now import the WXR file. The importer will install the WordPress importer plugin and your data will be there.
Once that’s done you should have just the posts, pages, comments, and revisions (I think). If something goes wrong or you don’t like the outcome them change the table_prefix back to the old settings and you’ll be right back where you were.
If something really goes wrong then restore the backup you made.