There are obvious benefits to spending the extra time and effort grouping your layers into folders and naming them appropriately.
For one you will appreciate the organization if you have to work further on the file after considerable amount time went by. Second, your coworkers or your css programmer will appreciate a neat file as well.
There are some less obvious and immediate advantages to such tidy practices. Design is not done on paper or on screen. Design is something you do in your mind. You continuously evaluate your work and make further design decisions while you work. Design is an internal dialogue and the result is your design work.
If you want to record any video content played in your browser you can use Snow Leopard's QuickTime X screen recording feature. If you want to avoid the need for cropping the video, put the video on full screen before starting the recording.
If you also want sound with your video you need reroute the speakers to the microphone with a software like Soundflower and select this new input source within Quicktime X as an input source for sound.
The fastest way to browse your directories in OS X is clearly the column view that you access by pressing Apple-3.
However in this view long file names are usually partially hidden, which can be a problem. Worry not, there is an easy way to resize the width of these columns. Just drag the separator line at the little handle at the bottom. This operation will only change one column at a time.
You must have noticed an annoying little bug in Snow Leopard. When you try to open multiple files it only opens one at a time. Unfortunately I couldn't find a perfect solution, but there is an intermediate workaround until Apple fixes it.