Use the “Edit Channel” tool. Here you can go to the “Videos & Playlists” Tab and alter which video appears in your channel. You might want the most recently uploaded one to be the most prominent, or you can select a particular video to always show, irrespective of what you upload.
“Player View” seems to give a more professional appearance to a channel than “Grid View”.

It’s worth tidying up your channel’s appearance with the “Modules” Tab. Consider deselecting all the tick boxes to remove details like comments, your recent activity, who subscribes to your videos, etc.

I once fell foul of allowing Channel comments by default. Although I got notification when a comment was left on an individual clip, I’d not realised viewers could comment on the entire channnel, too. There were a year’s worth of spam adverts for sex sites, plus a few other unpleasant remarks. I’ve now disabled this option!

If, like me, you run a work-related YouTube channel from home, beware too of enabling any setting that send notifications to Facebook or Twitter when you’ve favourited or commented on other people’s videos- or that show what you’ve been viewing in a personal capacity. Check which boxes are ticked in the “Activity Sharing” tab in you Account Settings as this can reveal your viewing habits too.

Finally, I need to upload a lot of recorded webcam clips to YouTube, and to do it quickly. I find the best way is to edit the video clip whilst its still stored on the DVD recorder’s hard drive. I burn this to a DVD RW disk where the video is contained in the largest .VOB file present. I copy that to my PC, simply changing the file extension to .MPG before uploading it straight to YouTube. Xilisoft Ripper is a low-cost solution to converting larger DVD recordings to .AVI format for editing and captioning in simple programmes like Adobe Premiere Elements.