Why thread, instead of editing wiki? Anyway, it may be good idea - thread results could get wikidi'zed, later.
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Chromium (chromium-browser from up to squeeze - wheezy version doesn't work on ARM at all) - with correct keybindings and settings, it works like native browser.

Using additions like scollbars-anywhere and no-scrollbars, we can mimic microB behavior of drag&drop scrolling, while having 100% of screen for web page content. Pages optimized for 1024x768 - especially, the ones that doesn't work on microB, due to far-left or far-right content being hidden and unreachable by scrolling - could get 100% usable, by scaling content to 86% (it makes 1024x* content to fit ideally into 800x*).

MicroB is damn good browser even today, but in rare cases where it fails, Chromium is all you need. And it works very fast (if using directory or partition based ED, as opposed to image-based one).

Cons:
To properly use fullscreen mode, one need start it via xephyr (lxde or other desktop environment). When run from Maemo's Ed without xephyr, context menu (right click) doesn't work (technically, it shows up *under* active layer). Chromium isn't only program affected by this - same apply to iceweasel, for example. LibreOffice is unaffected. No such problems under Xephyr.
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GIMP - for obvious reasons.
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UFRaw - it allows to fully manipulate RAW photos took using cssu'ish camera-ui or fCam&friends, without need for desktop. Further post-processing may be done with Gimp.
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LibreOffice - with correct UI size setting, it acts and looks like native Maemo application. Blazing fast, zero slowdowns.
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CUPS server - allows to connect suitable printers to N900, locally (via USB Hostmode) and print documents from LibreOffice/Photos after UFRaw/GIMP processing, without any desktop intervention. Awesome stuff.
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Audacity - for sound manipulation, works pret6ty fast (unless you decide to edit gigabyte-sized files on fly, that make them go into swap...)

/Estel

// Edit

Probably, one would be able to find some lightweight program for video editing, which we utterly lack under Maemo.