Here’s a list of mods I compiled from a number of sites. This list is similar to the one I posted on the nicecoder forums recently

Mod By Inspireme Mods By Zubby
FREE category Structure Paypal subscription mod
Link and banner sales mod Google custom search integration
Update Keyword Mod Youtube Video Blocks
Advanced Directory Stats Popular and latest search blocks
Coupon code mod SEO URL for search page
Geolocator mod Basic Listing with time period
Latest review Mod Contact mods
Latest Search Block Review notification for link owner
Expired links notifier
Mods By Bruceper Removing additional categories
Three free category structures - Country - State & Province Using Yahoo for web search
Category Mass Edit Simple new listing page
Update All Links Standalone Script Adding rss in categories and tags page
Email reminder for sponsored and premium listing owners Integrating wordpress into IndexU
InternetSecure payment module Google, Yahoo and MSN stats
Invoice system addon Colorful tag clouds
Updated mail templates Random site of the day
IndexU Category specific block addon Deep link mods
Regional Category List
Mods by gspinney
Mods By Dody
Google maps on your detail page 427 Categories
Yahoo directions search form Bidding directory mod