I've never used or really looked much at mYvBindex, however a majority of the code is ripped from other hacks released here without permission, like TECK's last 10 posts on forum home, or at least this was the case when it was first released which is why I refuse to recommend it to anyone.

Anyway to the real changes, again the templates have a different style between to two;
Current weather is built into mYvBindex, however is avalible as an addon for vBindex;
Calendar is built into mYvBindex, however is avalible as an addon for vBindex;
Top poster, newest member, and today's birthday's aren't shown on vBindex;
vBindex has a shoutbox builtin, its an addon for mYvBindex;