Current Nxt technical discussions between developers often occur on the bitcointalk forums;

Nxt Instant Transactions and Guaranteed Confirmations Discussion Nxt Instant Protocol development seeks to implement true 6 second transaction times as a Nxt Decentralized Application.

Nxt Cash – Proposal and Discussion Nxt Cash is the Zerocoin protocol developed by Johns Hopkins University implemented as an optional use Nxt Decentralized Application.

A search on the Nxt Firehose bitcoin talk forum for Nxt nodecoin will yield technical discussion of the implementation of the first coin deployment in the Nxt Asset Exchange.  This nodecoin serves the purpose of rewarding all active forging nodes on the Nxt network with nodecoin relative to their time spent securing the Nxt network, thus providing incentive to small holders of NXT to help secure the Nxt network.

The Original Nxt coin thread by BCNext.

Transparent mining 1, or What makes a 2nd generation currency? thread by Come-from-Beyond.

Transparent mining 2, or What part of legacy should be left behind? by Come-from-Beyond.

API of NXT Thread by BCNext.

Decentralized Asset Exchange Discussion Thread by Anon136.

Nxt :: Automated Transactions (AT) Progress and Discussion Thread by CIYAM Open.

NXT Cross Chain Transaction Bounty Thread by pinarello.

Decentralized App Store Thread by BCNext

NXT API 2 Brainstorming by ferment

Nxt source code analysis by ImmortAlex

Nxt source code flaw reports thread by BCNext

Nxt Web Service Providers: Progress Tracking Thread by abuelau

Anon136′s Silver Bullion Gateway Thread by Anon136

Nxt Full Feature Clients : Progress Tracking Thread by utopianfuture

Nxtopia — A MMORPG built on-top of the NXT network thread by swartzfeger

Nxt AppStore Thread by NxtAppStore

Nxt Discussion Thread to Allocate Funds for Projects from Unclaimed Coins by pinarello

Nxt Funding Committee Candidate Statements Thread by rickyjames

Nxt Marketing and Promotion : Nxt is now 100% Open Source! And now on Cryptsy! Thread by Salsacz

Nxt Trading Thread by Pouncer