hmmm
* "When spawning one tab from another, IE gives the tabs an identical color so you know they are related; with Chrome, they are all the same color."
I do not think I would have much use for that, but I can see how a very different workflow from mine might make that important. I wonder if there's a way to use the Chromium extension system to add that functionality. If so, I think an extension to do that would be superior to build-in functionality, because those who dislike it don't have to have it that way.
* "In Chrome, the tabs take over the title bar, so on a multi-monitor setup, trying to click the title bar to return focus to the browser is likely to switch tabs or worse, close one. In IE, there's still a full sized title bar. My preferences would be for the tabs to leave about 10 - 15 px. at the to provide some 'meat' to select the window."
I think there are Chromium themes that will fix that problem. Of course, there are other options for where to click than the title bar, such as the address bar, scroll bar, et cetera, so it seems like kind of a non-issue to me -- especially because I tend to consider a big titlebar something of a waste of valuable screen area.
* "In Chrome, no matter how small the tab, the 'X' to close the tab is aways available. In IE, once tabs get below a certain size, only the 'X' on the active tab is active, so you can't accidentally close a tab while trying to select it."
Weird. This is not the case on my install of Chromium. Maybe it's something added by Google to the Chrome-branded variant, or maybe it's a configuration setting, or maybe something something something. I can only speculate, I guess.
* "In IE, closing a tab activates the previous tab in the 'group' (letting you basically work backwards up the tab tree structure), in Chrome, it activates the next tab, which will take you out of the 'group' (which Chrome doesn't recognize anyways) if you were on the last tab of the 'group'."
This is another strange one. With my Chromium install, it works exactly as you describe IE working, except when you do something to break context (such as by visiting a tab unconnected with the group before coming back to the tab in question, which suggests a desire to deal with things separately from the group at least sometimes).
* "As you can see, these are all really minor gripes, but for someone like my who typically runs 20 - 50 tabs, because I'm got 5+ research projects occurring at once, it's a big deal overall."
I really need to cut my number of Chromium tabs to 50 at most today.