I’ve been using Flock for a couple of weeks now and overall I’m impressed with the work they’ve done. It’s a very cool product if you use either Flickr, del.icio.us, or are a blogger. There are some great tools that make this branded version of Firefox worth checking out. What I don’t like about it, is there are not enough good reasons to make me totally switch from Firefox. I do understand that it’s still in very early pre-beta status, so I look forward to further releases as I’m sure it will only get better.
I’ve read other people ask why Flock shouldn’t have just released a series of extensions for Firefox that users could pick and choose from as opposed to forcing people to switch browsers, and I think this strategy makes alot of sense.
For example, one of my favorite features of Flock should be a true Firefox extension. It is the tool that let’s you have collections of bookmarks that you can switch between on the Links toolbar (see image below):

I am a big user of the Links toolbar. I always put links to my active projects and a number of the web-based tools that I regularly use. Problem is that my Links toolbar becomes over crowded and unusable, so I need to delete items. The collection switching feature is great, as I can create different collections for different projects and easily switch between them.
This should be a Firefox feature or extension (maybe there is already one out there that I don’t know about).