We approach the traditional time of year for deciding whether to realize capital gains/losses or not, partly based on tax implications. This year may be potentially crucial because we could face tax rate hikes in next year or three, and also the Roth conversion folks have a one time option to defer and split a possibly huge conversion tax. Random thoughts:
It would be nice to sit back and see whether the Dems concede that Bush tax cuts on cap gains and dividends should stay to promote job growth, or whether they stick to their class-warfare stance. But I think as that becomes decided, you may be fighting the market. If Bush tax rates expire, there may be a massive selloff giving you few gains to realize. Actually there may be quite a selloff anyway, which I don't understand because a smart investor doesn't liquidate then sit around but makes a switch to another stock (not back to same one due to wash-sale rules).
So I am guessing maybe now is the time to realize gains and switch to slightly different but better stocks. Some say that you should ignore past performance and only sell things that look to have a bad future, but I think there is wisdom in the gut tendency to lock in the bigger gains because everything goes in cycles and your winners may be near topping for a while.
The dreaded wash sale has been my curse, preventing me from tidying up things even when I am not trying to realize gains. But there is so much choice now that it is normally easy to find a similar but better idea to switch into. I have one favorite big gainer though, and am considering switching out of it, then back into it in an IRA. Of course the IRA has no free money for that, but I turn it into a giant musical chair game which is fun and forces you to rethink stale decisions.
If a roth conversion is to be paid off this tax year, then maybe you want to harvest losses although I guess conversion taxes can't directly be set against capital stuff. Anyway some have to consider capital carryovers from last year which may be negative and could benefit from... (gets too complicated to enumerate, unless someone has a particular interest?)