I've decided to write a few custom COM Input plugins for Log Parser. I haven't seen any samples available on the Internet so I firstly decided to convert the VBScript Log Parser sample SampleQFE to VB.NET. It is available here.
Additionally I had a go at a multiline Input plugin based on the Visual Source Safe (VSS) 6.0 Journal file. Bit more tricky and implements a iCheckPoint feature using serialization. It is available here.
All code is in VB.NET format and licensed under GNU v2.0 license.
Given there isn't a lot out there if anyone has any comments I'd appreciate some feedback. I'll continue building some more as time permits.
P.S. I've also noted some advanced Log Parser querying techniques.