The total revenue from everything that isn't search, motorolla, or internet backbone transport is only about 5% of gross revenue. If they were better at interfacing with customers and better at making and selling actual products that slice could easily be half the company, if not more.
GMail isn't bad, but ultimately doesn't have half the features you can get for a SME on Exchange, simple things like stopping people emailing a document outside of the organisation. Very important (often a legal/contractual requirement) are simply not possible.
Cloud Hosting? Amazon and MS are out infront.
The thing they've got sewn up is YouTube, but the oddity about that is how awful the search / navigation on the site is. Like imgur they have a brand that people see embedded, I'm fairly sure people click on Reddit imgur links which they wouldn't for an un-known domain host.
But that doesn't mean a competitor can't come along and destroy them. In the rather profitable (and technically un-challenging) world of Meme Generation, we saw the incumbent cast aside this year, amongst some bad publicity. The same could easily happen to youtube.
So instead they stay cuddled up in their warm little search / ad revenue hidey hole where it's comparatively easy for them to dominate the market. While they chase facebook out of a false understanding of what the next generation of big computing corporations are going to look like. It's almost as though google, as a company, has some sort of institutionalized autism. Gdocs is a five year old project and yet it's stuck mired in mediocrity. But have you ever seen people trying to collaboratively edit a spreadsheet using sharepoint? It's a travesty.
As for youtube, they're clearly dominating the market in every way, except for the ones that matter. They don't understand the commitment it will take to turn youtube into a true competitor to HBO and netflix, not just in eyeball-hours but also in revenue generation.
Google refuses to make good on the innovations they've made (or bought) while at the same time they are incapable of trailblazing legitimately novel things. In some ways it's charitable to compare them to the bumbling, myopic Microsoft, because at least MS was capable of executing well into multiple different business areas (office, dev tools, servers, email, etc.) It's sad seeing so much talent going to waste.