I dual boot almost all of my machines with at least some version of Windows(2k, XP, Vista) and, generally, Ubuntu nowadays. (Mostly always have windows installed for gaming purposes as although wine has made HUGE increases in compatibility over the last few years there are still some games & apps that just don't run well with wine(I use the bi-weekly releases) + linux.
It's too bad that the author decided to no include Windows apps, as all of the IRC clients for linux aren't so hot for one reason or another, and uTorrent runs great with wine. (Yes, I tried all of the torrent apps in the article and still have some of them installed but haven't used them for quite some time. A great deal of games run well in wine, esp the more popular and cult sort of games although even some generally popular games will lack adequate support for some time. Also to note generally if you have a recent ATI GPU expect troubles as the proprietary drivers are alpha quality at best, and the OSS drivers do not yet support newer chips well and still lack good 3D support. ATI GPUs also tend to have more problems with wine as well as with linux + X.org in general. I learned this the hard way when I decided to give ATI a shot again and went for a notebook sporting a discrete 4850 mobility, but at least with ATI there is the hope for a good OSS driver. nVidia OTOH just has always had good linux + X drivers IME, with any bugs being fixed quickly, so no need for OSS drivers unless you are philosophically inclined to be a GPL bigot(I always preferred the freer licenses myself, e.g. BSD.).)
Web browsers:
Epiphany -- has two versions now, one that uses gecko and the one that I believe will be the default in the future that uses webkit. IIRC Ubuntu only has the gecko based one in the repos ATM as the webkit version is still alpha.
Chrome -- available on Ubuntu through a PPA, but well, Chrome is just arcanely useless especially given that I use firefox + a bevy of plugins whose functionality simply cannot be replicated with Chrome ATM.
Use the lynx CLI browser once in a while too, esp when I get docs in HTML and can't be bothered to open them through a full GUI browser, although if the app authors decided to be cute(and you don't override the colorization settings) such documents can be somewhat unreadable if the doc author played with various colorizations of the app, esp. the background colors.
Didn't see IRC apps listed, but I like the basic X-Chat 2 IRC client, not the GNOMEized version(UI sucks -- removed a host of useful options, plus the final display layout leves a great deal to be desired. CLI clients are useful at times as well.).