Today I’ve released another software on CodePlex: JustSubsPlayer
It can be used to add subtitles (.SRT) to online videos (many video players can play subtitles, but only if there’s a local video file to play).
It is written in VB .NET and is based on .NET Framework 3.5 and Windows Presentation Foundation.
Download link: http://justsubsplayer.codeplex.com/
You can use Sublight to search and download SRT files.