Inflatable churches are not new, but this is an interesting story I found linked on the America blog. Check out the BBC video with this quotable from Father Andrea Brugnole, head of the Sentinelle del Mattino, a youth-driven evangelization effort:
God called me to dedicate my life to young people, to go among them and find them, because today it is hard for young people to go to church. So it has to be the Church that goes to them.
Observations:
From 1:07 to the end of the video, note the singing and clapping at Eucharistic Exposition.
A more traditional sensibility, though still in an unusual setting:
An example of tent architecture, which as you know from Catholic tradition, is not entirely unorthodox:
Not everybody is edified. Commentary on the effort from various web sources include:
(G)et dressed, leave the beach and go to a proper church.
(T)o erect a church in the midst of sunloungers, beach umbrellas and men and women in “various stages of undress” is “squalid.”
I hope they keep the noise down and don’t bother other people who are just there for fun in the sun.
Terribilis est locus iste: hic domus Dei est, et porta caeli. (A church is a place of awe, it is the house of God and the door to Heaven.)
As for me, I think it’s brilliant. Clearly not every young Catholic is turned on to Gothic architecture and chant.
Catholic Sensibility 
The volume on the BBC’s video player goes to eleven. Nice.
Just from the pictures, I find the first one a little off putting, I find the second one risible, but the third picture seems suitable to me, if you are going to attempt prayer or worship without a fixed structure.
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