Firstly, MyADSL is a brilliant site, with a great mission and a great community behind it. This is constructive (hopefully) criticism aimed at making it better.
Ok, here goes. (Btw, perhaps we could have a sticky thread dedicated to this topic somewhere.)
URLs
http://www.mybroadband.co.za/nephp/? should be
http://www.mybroadband.co.za/
Reasoning: Firstly when a visitor requests the home page at
www.mybroadband.co.za/ they get redirected to /nephp/?. This involves 2 round trips to the web server instead of just one and will be slightly slower. This may also adversely affect things like spiders and page rank (could be wrong though). It also goes against reasoning since one would expect the home page to exist at
www.mybroadband.co.za/ and in my mind the /nephp/? on the end is ugly and unnecessary. I suspect it was setup like this to help with the transition from the old server to the afrihost servers.
http://www.mybroadband.co.za/vb/ should be
http://www.mybroadband.co.za/forum/
The forum should live /forum/ and not /vb/. Using /forum/ is clearer and makes sense to the user and is also independent of the software being used. If tomorrow you decide to swap to phpbb you could still use /forum/ and everyone would still know where the forum lived.
(If you want change the location of the sites without breaking existing links you can do so with either symlinks at the file system level or some apache url rewriting)
target="_blank"
Ok, the reasoning behind this is usually something like this: Site owner wants to try keep visitors on his site as long as possible so he makes all external links open in new windows so his site stays in open in the background.
What actually happens: User clicks a link and expects it to open in the same window (like 90% of other links). Instead it opens a new window. They then have to swap back to the old window, close it, and then continue surfing in the new window. Doing this repetatively equats to alot of unnecessary work. Also, the more savvy users know they can open links in new windows by control-clicking if they really want to. I'm sure you could probably find a Nielsen column where he rants about what a usability blups it is but at the end of the day I think most users will agree with me thats its just very annoying. If possible please kill all the target="_blank" attributes.
Home Page
My main gripe with the home page is that the 2 column layout you're using for the articles doesn't work too well. It chops off not only the full headline but also the summary text which is unnecessary in both cases. Switching to a single column layout will solve this problem nicely. There's also a few things missing from the articles that should be there.
A sample article on the home page could be like this
Wifi Zone: (category linked to category page) Internet Solutions expands wireless hotspots (headline linked to article)
ICTWorld, 31 March 2005 (Date and source should be on home page too)
Category image next floated to the right of the summary text. (Btw the images aren't anti-aliased properly)
Summary text. This shouldn't just be the first x sentences, rather a short summary or the most relevant exert from the article. Its up to the editors to decide on a good summary.
Read more (link to article) | 27 comments (link to comments section of article - more on this later)
Ok, I think thats enough to get started with. I've got a lot more but lets first hear what everyone else has to say
.
... so you can count on me as a daily unique visitor 
) as a MyADSL member - especially when Mark is crusading for overlapping causes - if nothing else it would be nice to have url linkage between say MyBroadband.co.za and go-opensource.org (that's the only site I know of due to SABC2 programme, I'm sure Mark has some other related sites somewhere).