If you need to edit some video away from your home, free web-based video editor JayCut will likely get your project going, whether you need simple cutting and pasting of text, transitions and impromptu audio recording.
Click on the image for a closer look.
JayCut is a remarkably full-featured video editor for the web, comparable to something like iMovie or Windows Movie Maker (as opposed to the more advanced Adobe Premiere or Apple Final Cut). You have two tracks to which you can upload and add video clips, audio and add text and transitions. You can also record audio straight from the weba pp with your microphone, as well as video from a webcam. After you're done, you can publish your video to YouTube or export it to your computer as H.264 Flash video, H.264 MPEG-4 or an Xvid AVI.
There are definitely a few quirks that threw me off at first - for example, transitions need to be made between tracks and with overlapping video, and you can only preview your movie from the beginning - but overall it's pretty incredible for something that runs in your browser. If you want to save projects and come back to them later, you need to create a free account, but for one-shot video edits, you just need to fire up the demo. Hit the link to check it out. Also note that I had some weird issues in Firefox trying to export my video - it wouldn't let me input my information - so you might want to run a quick test in your browser of choice before editing your three-hour masterpiece.