1. Match.com
2. Do things with work friends. Hold a BBQ or something.
3. If you have neighbours, and its a nice summer afternoon, hold a BBQ or something.
4. Decorate the house. Hold a house warming - work friends, family, friends, neighbours - tell them ALL to bring friends.
5. Join a Singles evening.
And if work is getting in the way that much, and thats the reason for you being so lonely - find a different job.
You can't live your life centered around work.
As I'm sure you know, you get old too quick.
But the point is, you're never too old, so get out there and bloody do something about it! Pick yourself up!