This script allows you to check the several availability windows for the current day, and thus more surely program any maintenance windows without stopping SQL Agent jobs. Just paste into Query Analyzer and run. SQL 2000 variant.
Update: Now gets information about backups made outside SQL Server, like Veritas or IBM TDP. Optimized several parts of the calculations.
Edit: Looks like some of the indentation i made in the online editor when submiting broke the script.