It's starting to look like the second act of my two-act play is going to be longer than the first. Is this bad?

No, it's perfectly fine for second acts to be longer than first acts, In most cases they are. There are plenty of shows out there that have a second act longer than the first act. Act breaks don't normally come at the exact middle of the show, they come at the climax, or first climax (I've written shows with more than one climax).
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Script Frenzy '08: Midnight-Planning
JulNoWriMo '08: The Phantom Keepers 2 (Title TBA)-Planning
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How about if act one is longer than act two?

Medusa's Muse
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In my experience, Act I is usually longer than Act II (in two-act stage plays). I don't know if there is a specific or conscious reason for this; the only thing I can think of is that since intermission will come between the two acts, you don't want your audience sitting longer between the beginning of the show and intermission, than between intermission and the end of the show. (This is one of those unfortunate situations where art is compromised by insignificant details such as people needing to go to the bathroom and stuff of the like.)

If I knew more about "proper" writing (and did things like outline my stories before sitting down and writing), I could give a better answer, referring to "rules" that talk about the rising action and denouement, and how the former is usually longer than the latter, which would make Act I longer than the fallin-action Act II (since the break between them comes right before/at the climax). Now, if you're talking about the three-act structure film professors like to jabber on about, then your stage-play Act I is their acts one and two, and your stage-play Act II is their act three. (If that makes any sense.)

:)

Criss, la Reina
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My first act is going to be way longer than my second act. So much so I was thinking of turning it into a really long one act play. Anyone out there have any idea whats too long for a one act?

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"Up with this stupidity I will not put."
(His view on never finishing a sentence with a preposition.)

Winston Churchill

Anything longer than about 90-100 minutes is going to make the audience uncomfortable in their seats.

I'm no expert, but when I hear "one-act plays" I think of UIL competitions - where full-length plays are cut down to fit in the 40(?)-minute time limit (the school will be disqualified if the performance runs longer than the limit).

Write it how you want to write it; make a hugely-long Act I and short Act II. If the director thinks intermission should come earlier than the act break, he/she can easily decide to break after any particular scene. Or, if he's cool enough, he can make up a break, like a certain creative genius I know did when he directed Steve Martin's "Picasso at the Lapin Agile," which has no act or scene breaks.

There are no rules, this is art. Just write. Worry about it in May.

Criss, la Reina
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Yeah, when I was in "To Kill a Mockingbird" last year, the intermission came at the climax of the courtroom scene in the script, but we felt that that would have been a first act that was entirely too long, so we pushed the intermission back to just before the courtroom secne began. A lot of it is the director's call on intermission.
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Script Frenzy '08: Midnight-Planning
JulNoWriMo '08: The Phantom Keepers 2 (Title TBA)-Planning
NaNoWriMo '08:Wyatt Cane and the Looking Glass-Planning