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Sean K Reynolds did several template classes in a series of web articles on the WOTC web-site called Savage Progressions. I'll see if I can paste a link to the archieve: http://www.wizards.com/default.asp?x=dnd/arch/sp
Surprisingly, Half-Celestial wasn't done as a straight up progression. He did a Half-Fiend progression which should work as a base to develope a Half-Celestial progression. He also did several transitional progressions from one race to another, such as Half-Drow/Drow, Tiefling/Half-Fiend, Feytouched/Half-Fey, and ... Assimar/Half-Celestial.
Plenty of information there to help crafter a straight up Half-Celestial Savage Progression.
There's an article in Dragon 326 on adding a half-elemental template one level at a time.
Has there been a similar article already in Dragon (or in any other book) for half-celestials?
I've done some Google searches for it but I didn't find anything.
Dagobert
Half-Celestial progression was done by Sean K. Reynolds in his book Anger of Angels, published by Malhavoc Press. This is most likely why he never did it for the Savage Progressions article series on the official website. Likewise, the Celestial template is in that book too, which is why it was never on the website. Anger of Angels details how the template might be gained by an existing character, which was the intent of the half-elemental article, although it touched on the idea briefly.
If you're interested in the idea of angels in a D&D game I'd suggest buying the book in PDF form, it shouldn't be too expensive at the moment. If you're only looking for a half-celestial progression, you can take the half-fiend progression and change it to match the half-celestial template.