Two examples for financial news that are quite usable:
http://www.marketwatch.com/newsviewer
For the MarketWatch site, link is just to their own in-house write-up, but you have the option to mouse over and bring up stock charts, etc. On CMWire, lag in updates is every three minutes or so, making it very timely.
Mobile-wise, HN News remains my go-to reading experience ;)
http://seekingalpha.com/market-news/all
However, it does seem unnecessarily javascript-heavy when we are talking text, and it aggressively auto-reloads (sometimes when I'm in the midst of reading!). There seems to be a usability mismatch among people that use 1 browser with one tab open vs. people that utilize multiple browsers and/or multiple tabs.
edit: I, personally, use multiple browsers, some with multiple windows, and some of those windows with 5-60 tabs (i.e. HN). Graceful degradation used to be a concept highly regarded among developers that addressed these usage scenarios, but now we cater to the lowest common denominator only.
Protopage is somewhat similar to Readspike and you can add your RSS feeds of choice.... http://www.protopage.com/