You can use the update status module to monitor when your installed modules have versions for a targeted Drupal core.

http://drupal.org/project/update_status
Cog Rusty wrote:
  


  
It is fine to stay with 5.9 (or better 5.10) until the modules you
need are available. To make sure that a future upgrade will be easy,
use only 5.x modules which also have a 6.x version under development,
or are expected to have one.
    

Ok, will do. I'll stick to modules that have a 6.x version in the works.

Thanks for the help.

Daniel.