Well, I do not tend to write technological forecasts. There are people out there how are much better at this and even they are often wrong. But this year I will give it a try. Some idea about next year's trends in the web:
The credit crunch will get worse next year. It will also affect the web world. A lot of startups will close the doors because they will not find any money. For others this will also be a good posibility, in a time where you even can't trust the banks, investors will search for startups with serious business plans.
For the big ones in the web the time will be pretty hard. There shareholder will ask question about how they will get their money back. Facebook has to find a way to make more money. I think it might be likely to see in 2009 more ads on facebook or "pro-accounts" for which users have to pay, possibly also both.
Google has possibly to stop some projects that do not generate enough money. Or create also a way to pay for these services. This might affect Google Chrome, Google Analytics and others. Likely Google Chrome will not reach more then 1-2 Percent Market share, Google will stop this project and support Firefox instead.
As there is still no usable micropayment (well paypal is still not there and will probably never be) out there I expect Google or Facebook (or a new startup) to come up with one. Possibly they buy a bank for this (UBS anyone?! Ok, this is not serious.)
But with the accepance of Cloud Computing a lot of classical providers (the big German ones) will introduce new price models and also some kind of cloud computing. I think it will be very likely that also some cloud computing open source solution on the base of xen and the LAM* stack. Some comercial solutions will probably follow. This might include Sun with glasfish, mysql and solaris, Microsoft with the dotNet platform and probably others.
Big companies will provide users (open source projects and big customers) some cloud systems to test their software. Microsoft does this already for some open source project. But also commercial Projects (that write clientsoftware) might profit for this. Probably also Red Hat, SuSE/Novell or Sun will follow this example.
Not out (, yet)
I think 2009 will be a year of vaporware. We will not see PHP 6, Perl 6, MySQL 6 or Duke Nukem Forever. The first 3 of this will fight with a bigger community and it will be hard to find desisions. I'm in doubt if MySQL six will ever be here; Forks of it (like perconas version and drizle) are very likely to overtake the lead and will stop sun to work on MySQL longer then Version 5.
2009 will be a hard year for the whole web. But as long as you think you cannot be replaced trough the 3 bellow your job might be still secure. So I wish a very good 2009 to all of you.