Jon, There's setting you can change so new videos get added to the beginning, that way people browsing the vid gallery will always see the newest stuff first. I did it on the readers rides one - obviously forgot on the vids.
From the General Videos Gallery page, login. Then from the dropdown at the top (next to slideshow), choose properties.
Scroll down to "Add new items at beginning of album" and choose Yes.
Then hit apply, followed by close.
You might want to then re-order the vids already in it.
From the "album actions" drop down again, choose sort items. Probably leave "By Upload Date" selected, but change the drop down to Descending. Then hit sort, and bobs yer uncle!