Hi Patrick,
Overall the site looks good - nice clean layout, no fussy banners & sidebars and other drivel
On my first run-through I picked up the following :
Definitely need lines between the shares or an alternating background shade on the purchase page (already mentioned by someone above)
Include something on the front page about the portfolio valuation methodology - (Semi-live, closing price or whatever)
Please acknowledge the source of the pricing data - The JSE is very particular about who uses their data and how it was sourced - you might need to get permission from them to re-publish the data even though they provide it on a public web site and it is delayed.
That's all for now - I'll play around some more and let you know how it goes.
Cheers,
Q.