Is it feasible to start writing a question and SE could find which forum is best for the question?
138305
Automatically suggest asking on another site
20138
Allow cross-posting of questions to more than one SO site
25698
Where do I ask where to ask?
98520
Where to post questions asking for expert opinion?
157730
The question wizard might be useful for Meta Stack Exchange too; should we give it a try?
25104
Is there a sandbox to post test questions?
105912
Are Stack Exchange sites forums?
78898
Where should I ask questions about programming without a _real_ problem?
55072
On which Stack Exchange site should I post subjective questions?
16409
Which Stack Exchange site is best for Microsoft Excel questions?
4388
Why can I only choose certain sites for migrating a question?
122247
Discussion/Talk page on Questions
131094
Is there a Stack Exchange site for asking questions about where a question goes?
77534
Best practice for marking own questions that could belong on another/multiple sites
106223
How to find the right questions that I can answer?
27739
Is it okay to use Stack Overflow as the support forum for a product or project?
92043
Is there a more user friendly way to figure out where your question fits?