Saw about it on the official Gmail blog.
Here is the post:
Fast PDF viewing right in your browser.
The Gmail team seems to be on a roll - they're bringing out new features fairly often these days .... good stuff :)
I like many of their Gmail Labs features. The forgotten attachment feature is another useful one.
And speaking of fast PDF, a plug from me: if you haven't already, try out my xtopdf toolkit for fast and easy PDF creation - from text, DBF, CSV, TDV and XLS input formats :)
All you need as prerequisites are:
- Python (version 2.2 or higher)
- the open source version of the ReportLab toolkit
Then install xtopdf as per this guide.