Their front page is still one of the smallest and simplest on the internet, with about a hundredth of the cruft found on their "competitors’" front pages (I use quotes because I wonder if anyone is really considered a competitor to Google in search– probably not). This minimalism carries pretty well across their suite of web applications too… nothing they produce feels like a kludgy copy of a desktop app.
I particularly like the special searches which allow you to "search" for the answer to an equation or conversion
unit conversions: 6 litres per 100 km in mpg –> 39.2024306 miles per gallon
mathematical: e^(pi*i) –> -1
time zones: time in Sydney or Sydney time –> 8:01pm Thursday (EST) – Time in Sydney, New South Wales
The latter is particularly useful I think, because every other web site that does time zone conversion seems to have multiple dropdowns to fill in and still expects you to know which time zone a place is in and whether it’s daylight savings or not.
I like that they let you view PDF results in HTML, since generally I am looking for actual searchable information and don’t care so much for the formatting, and like many people I wince when I realize I’ve just made the mistake of clicking on a pdf link.
There are only a few things that they don’t get quite right IMHO. Chat in gmail seems rather flaky at times and can fail to send messages without telling you exactly which parts were lost. It would be nice if the "define:" keyword could return a result that felt reassuringly comprehensive rather than a smattering of sources not necessarily useful or reliable– if only they had an arrangement with the OED or something similar. Gmail load times seem to be growing longer (a couple of seconds for me); I assume because they are packing more functionality into the javascript.
Maybe they are trying to take over the world, maybe they are becoming a little bit evil… at this point I don’t mind, because they are still charming :)