KISS, there are many things you can add, and they all -might- be useful -sometimes- but in general, users will start getting lost, and the real content will get shaded by all the "rich" surroundings. A good system is said to be not one where nothing else can be added, but one where nothing more can be removed. I don't think the autolinking feature is really that needed, and I'm more comfortable reading text without random links that could be googled in a single hit, and don't enjoy another visit to preferences to switch something off.

Where I might see something like this: But not links (that disrupt current course of reading, switching pages/tabs and all just to see the content) - but auto-insert of something like the ABBR tag that displays a baloon when hovered over - in part names, containing a short outline of selected part. I don't remember whether 74LS28 is a NOR or a NAND, I don't remember whether DS87C520's flash is reprogrammable or write-once, and a glance at some essential info at non-standard important features in a mnemonic form, like:
"8k prog flash 6xADC12b 2xDAC14b SPI 2ports RTC WD PSMon"
would explain a lot about given chip.
...of course filling such a database wouldn't be a trivial task...