IDW are doing that right now with their Transformers: Autocracy series, published every week (fortnight maybe?), 12 pages for $0.99 (€0.79).
Ah ha, thanks for that information, it does seem to suggest this might be an emerging format for the future. Keep an eye out for more people following this model.
What about a digital only '2000AD Extra' every week? One extra strip for a few cents? Surely the loyal fan base would get it, it might even bring in a few new readers (assuming Clickwheel isn't used), and would be cheap as chips to produce. A definite goer in my opinion.
The idea of a webcomic has been suggested by some folks on the board (my thoughts on that
here), this approach might be a way to monetise that. It needn't be either/or - FreakAngels was heavily downloaded despite being free to read online, I wonder if, with the next webcomics, Avatar are going to do a quick bundle of pages and offer them cheaply online electronically. I'm sure there'd be enough people who'd pony up a few cents rather than seek out the torrents, plus it might reach a different audience (folks might stumble across it following Ellis' other works on the iStore, comiXology, etc.).
Of course, using this model you could also see how something like a fortnightly collection of 10 Dredd pages might be an option. However, there are dangers of splitting open an anthology like that - as you might loose readers who are only interested in one or two stories but economics might suggest the prog has already lost those readers to trades (as it doesn't make much sense for someone to buy the prog for a couple of stories) and it might be able to win them back to serialisation, which could even get them double-dipping like a lot of us who get the prog and the trades. Plus it could always hook in new readers too. A tricky one to judge there.