To update a 1.7 theme to 1.8.0 and 1.8.1
1. Backup your original theme
2. Delete the admin directory of your theme
3. Copy from the 1.8.0 professional theme the directories admin, jquery_ui, tooltips
4. Copy from the 1.8.0 professional theme to your theme directory all login*.html files and the noscript.thtml file
5. In footer.html add {plg_footercode} just before the close body tag
6. Remove any javascript tags from header.html (that Geeklog uses)
That should get you started (I don't think I forgot anything).