This is an interesting blog post about some tips to prepare for a VB migration.
Link to Migrating VB6 to VB.NET Safely « Star Struck Developer
Interestingly, now the dilemma is no longer weather I should upgrade or not but HOW do I upgrade and minimize the potential issues in doing so.
"But life does march on and .NET is now an essential part of any serious developers inventory. So this is the strategy I am following to at least provide the team the opportunity of migrating code to C# or VB.NET."