Share your mods here! To share tracks and ships you can find the appropriate .ship and .trksn files in the MyTracks and MyShips folder, to share sounds you're going to want to archive your sounds folder and share that. If you share a track then also make sure you include the .VCM file, this contains the lighting for the track.
If you are running the Steam version of the game then all of this is handled for you, you just need to use the workshop uploader included in the mod tools.
Links:
Steam Workshop
Documentation:
Custom Ships List
Track Editor Guide
Ship Editor Guide
There's also an IndieDB page here that you can upload stuff to - http://www.indiedb.com/games/ballisticng/addons
Created Mods
Ships
Xpands' Barracuda Prototype
Xpands' Hackers/Wipeout cover art ships
Meg.A.Bytes' Nullcer
Audio Packs
GGeeks' alternative track intros