It is possibly more difficult to concentrate in a cafe (if by "cafe" you mean something like Starbucks or Second Cup), what with all the people coming in and out and all the chatter.
I have not extensively tried to work or study in a cafe myself, so I don't know how well I cope with all the distraction.
<sarcasm>
Maybe those users still have 4:3 monitors and want to make it feel more like a widescreen without spending more money.
Make a toolbar and call it the "Toolbar Curator Pro 2011“ so the user can hide/disable other toolbars easily (Hey, most of them don't know that you can open "Internet Options", go to the "Programs" tab and click on "Manage add-ons".) Then, market it by saying how it's free and it even comes with Alta Vista search function. I bet most of those users don't have Alta Vista as a search provider in IE8 and it would sound so new and hip to them.
</sarcasm>
Seriously though, I think sz's suggestion is not bad.
I believe that toolbars are just one facet of the bigger problem. Toolbars clutter the UI, but there are also BHOs that are invisible and waste memory and processor, not to mention their inherent spy-like nature. They are even more evil than toolbars. I think Microsoft should drop the name "Browser Helper Object". To me, the name "BHO" is unnecessarily long and complicated, yet it doesn't convey a lot more meaning than "plug-in" or "add-on" (to the non-geeky user anyway). When the user tries to disable a toolbar in IE8, the browser also prompts whether to disable related BHOs. And I bet that most users are uncomfortable disabling BHOs because the name sounds foreign.
I have not extensively tried to work or study in a cafe myself, so I don't know how well I cope with all the distraction.