One of the biggest complaints about SSIS since it release in November 2005 has been its inability to load files with differing row formats. There's an infamously monster thread about it over on the SSIS forum.
Hopefully some of the complains are alleviated with the release of a new delimited flat files reader on the SSIS Community samples project on Codeplex. I admit that I haven't installed it and played with it but if it does what it says on the tin a lot of people should be placated. Head over to Matt Masson's blog for more info.
-Jamie