Read my CodePlex post @ http://migratealerts.codeplex.com/

This powershell script will help you to import alerts from a CSV file into SharePoint 2010. This is particularly helpful when you are migrating from SP2007 to SP 2010 where alerts are not migrated. I have another project http://allalerts.codeplex.com/ which can export all alerts available in a Farm into a CSV file. You can then use this Script to import all alerts in that CSV file. Obviously you have to CHANGE ALL THE TARGET URLS IN THE CSV FILE BEFORE IMPORTING.

Cognizant's SharePoint CoE now has an in-house Migration Suite called CSMS[Cognizant SharePoint Migration suite]. This is set of ready to use tools and templates for doing any migration project involving SharePoint.
As part of this suite, they also have a tool for Migrating from Lotus Notes to SharePoint. This tool is cool !! No server installations required for this tool, and works using the SP out of box web services.
This tool will be a huge benefit for its customers.

Congrats to Cognizant team who built this Suite.