Developing the domain e.sg

I own the super short domain name e.sg (one char)
Wondering what I should develop around it.
Thinking of offering email hosting (short fancy email addresses for Singaporeans?).
Right now I offer it as URL Shorter service but my branding for that one is bad and I don't really have an advertising budget.
Selling subdomains is not possible under the .SG contract (they don't allow anything that comes close to selling domains).